Tom Flanagan is back.

About a year ago, the former adviser to Prime Minister Stephen Harper became persona non grata among most Canadian conservatives for publicly questioning whether it makes sense to jail those who view child porn.

Though he apologized for the remarks, Flanagan was virtually disowned by Harper Conservatives and members of Alberta's Wildrose Party.

Yet, last weekend, the one-time Conservative strategist and fellow at the University of Calgary's School of Public Policy participated in an authors' panel at the Manning Networking Conference.

The gathering of right-wing politicians and thinkers rebuked him last year once the controversy erupted.

With the release of a new book, "Winning Power," and an upcoming tome addressing his fall from grace, "Persona Non Grata," coming out in April, Flanagan has now returned to the spotlight.

But what he has to say about the state of Canadian politics may not please his former boss, Harper.

Last week, Flanagan told Postmedia's Mark Kennedy that Harper's efforts to discredit Liberal Leader Justin Trudeau are failing because it's hard to attack someone "who is held in higher esteem than you are."

Flanagan suggested Trudeau has been difficult to rattle because he is so unlike the prime minister.

"Where Harper is cunning, Justin seems almost naive. Where Harper is focused, Justin seems a bit scatter-brained," he told Kennedy.

"Where Harper is controlled, Justin seems spontaneous. Where Harper seems ruthless and vindictive, Justin seems pleasant and amiable. Justin is athletic, and Harper maybe was at one time but that was 70 pounds ago when he ran cross-country in high school."

But Flanagan also recently sat down for lunch with Global News' Laura Stone, where he shed more light on Harper's approach to politics.

"Stephen is a predator," he told Stone. "It's whoever is in his sights."

In a revealing interview, Flanagan discussed everything from his fallout with Preston Manning to Jason Kenney's rumoured leadership aspirations. He even expressed concern about how Harper has surrounded himself with long-time loyalists since the Senate expense scandal blew up.

But perhaps the most intriguing moment was when he said that while it may be "possible" the prime minister didn't know about the infamous $90,000 cheque Nigel Wright cut to Senator Mike Duffy, he finds it "hard to believe" Harper wouldn't know of earlier attempts to transfer money from the party to Duffy.

"He may not have known the precise amounts, but it's hard for me to believe he wouldn't know something of that type was happening," he said.

Flanagan was also quoted in an article in The Hill Times on Monday as one of several experts who agree that the Harper government's overhaul of Canada's elections laws will benefit Tories most in 2015.

"All this legislation is neutral on its face, but probably gives the Conservatives a relative advantage in this electoral cycle," he said. "The Conservatives are going to be extremely well-funded in this election campaign. They'll have far more money than they could ever spend in the writ period so they will be able to have a very well funded pre-writ campaign."

Flanagan had a famous falling out with Harper after he wrote a book detailing the Tories' rise to power from an insider's perspective.

In the 2011 election, while the PM was busy warning that Liberals, NDP and Bloc would form a coalition, Flanagan told a journalist that the "co-opposition" deal arranged by Harper in 2004 with former NDP leader Jack Layton and Bloc leader Gilles Duceppe was seen as a step in the direction of a Harper-led minority government.

Will Flanagan again complicate things for Harper in the next election? Based on how he has been speaking to journalists of late, it seems likely.

Also on HuffPost:

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  • Whoops, How Did This Get In Here...

    Part of a painting of Prime Minister Stephen Harper fully nude, by Kingston artist Maggie Sutherland, is shown at the Central Kingston public library in Kingston, Ont. on May 18, 2012.

  • Stephen Harper and wife Laureen in 2011. Source: <a href="http://www.flickr.com/photos/pmharper/8472663517/in/photostream" target="_blank">Flickr</a>

  • Beer Me!

    Prime Minister Stephen Harper gets behind the bar at the Victoria pub in Montreal Friday, March 16, 2012 where he stopped in to meet some supporters and have a drink for St. Patricks Day.

  • You Eat Half, And I'll Eat Half

    Conservative leader Stephen Harper and Laureen Harper stand next to a tray of hot cross buns at a bakery in Mississauga, on April 23, 2011.

  • Cuddle Time!

    Stephen Harper with wife Laureen and their chinchilla Charlie. Source: <a href="http://www.flickr.com/photos/pmharper/8425819048/in/photostream" target="_blank">Flickr</a>

  • Easy Rider

    Prime Minister Stephen Harper waves after going for an ATV ride as he visits a farm for a campaign event in Wainfleet Ont., on Monday, April 4, 2011.

  • Nom Nom Nom

    Prime Minister Stephen Harper eats maple taffy as he visits a sugar shack in Norbertville, Quebec on Tuesday, April 5, 2011.

  • Muahhh

    Prime Minister Stephen Harper gives his wife Laureen a kiss following a day of G-20 meetings in Toronto. June 27, 2010. Source: <a href="http://www.pm.gc.ca/eng/media_gallery.asp?media_category_id=938&media_category_typ_id=6#cont" target="_blank">Pm.gc.ca</a>

  • Can I Keep Them?

    Prime Minister Stephen Harper plays with foster kittens at 24 Sussex. May 1, 2010. Source: <a href="http://www.pm.gc.ca/eng/media_gallery.asp?media_category_id=900&media_category_typ_id=6&media_id=5512" target="_blank">Pm.gc.ca</a>

  • Incoming!

    Conservative Leader Stephen Harper throws a small snowball at photographers after talking with reporters at a campaign stop in Guelph, Ontario Saturday, Jan. 21, 2006.

  • Thank God You're Not Wearing Overalls

    Prime Minister Stephen Harper gives Taylor Swift the book "Maple Leaf Forever" before her concert at Scotiabank Place in Ottawa. May 20, 2010. Source: <a href="http://www.pm.gc.ca/eng/media_gallery.asp?media_category_id=900&media_category_typ_id=6&media_id=5512" target="_blank">Pm.gc.ca</a>

  • Wedding Crasher

    Stephen Harper <a href="http://www.huffingtonpost.ca/2012/10/23/harper-wedding-photos-ottawa_n_2006374.html" target="_blank">surprises an Ottawa couple on their wedding day</a> in 2012.

  • Yep, Definitely A Cat Person

    Laureen Harper laughs as she holds a husky dog with Canadian Prime Minister Stephen Harper as they tour Caribou Crossing, Yukon, south of Whitehorse Monday August 20, 2012.

  • Harper Road

    Stephen Harper, his children Ben and Rachel, and wife Laureen cross Abbey Road in 2009. Source: <a href="http://on.fb.me/12OfGXN" target="_blank">Facebook</a>

  • Bonjour, Bonhomme

    Prime Minister Stephen Harper hams it up with Bonhomme Carnaval in the Prime Minister's Centre Block Office. November 25, 2010. Source: <a href="http://www.pm.gc.ca/eng/media_gallery.asp?media_category_id=1238&media_category_typ_id=6#cont" target="_blank">Pm.gc.ca</a>

  • Trendsetter

    Canadian Prime Minister Stephen Harper, far left, watches a third round match between Agnieszka Radwanska, of Poland, and Serbia's Jelena Jankovic with his children Rachel, center, and Benjamin, right, at the 2012 US Open tennis tournament, Saturday, Sept. 1, 2012, in New York.

  • Psst! I Like Your Hat

    Catherine, Duchess of Cambridge, speaks with Canadian Prime Minister Stephen Harper during Canada Day celebrations on Parliament Hill in Ottawa on July 1, 2011.

  • Giggle Fit!

    Prime Minister Stephen Harper and his son Ben watch a bloopers show while attending the Calgary Flames NHL hockey game against the Edmonton Oilers in Calgary, Saturday, April 11, 2009.

  • In The Key Of C Major

    Prime Minister Stephen Harper practices a few chords after arriving at home from work. February 19, 2011. Source: <a href="http://www.pm.gc.ca/eng/media_gallery.asp?media_category_id=1457&media_category_typ_id=6#cont" target="_blank">Pm.gc.ca</a>

  • Love You, Mom

    Conservative leader Stephen Harper gets a hug from his mother Margaret during a visit to his campaign office in Calgary, Saturday May 29, 2004.

  • We Can't All Grow A Pirate 'Stache Like Trudeau

    Prime Minister Stephen Harper holds up a moustache scarf to kick off the start of ‘Movember’, November 1, 2012 Source: <a href="http://www.flickr.com/photos/pmharper/8146161138/in/photostream" target="_blank">Flickr</a>

  • The Sweet Side Of Politics

    Senior Legislative Assistant, Katherine Locke, left, and Government House Leader Special Assistant, Zoe Lawson, show off their House of Commons gingerbread house to Prime Minister Stephen Harper in his office on Dec. 16, 2010. The gingerbread house was filled with rows of gummi bears as members of Parliament. Source: <a href="http://www.pm.gc.ca/eng/media_gallery.asp?media_category_id=1355&media_category_typ_id=6#cont" target="_blank">Pm.gc.ca</a>

  • Beach Boy

    Prime Minister Stephen Harper waves to tourists as he walks on the beach after the closing of the VI Summit of the Americas on April 15, 2012 in Cartagena de Indias, Colombia.

  • Game Face

    Prime Minister Stephen Harper plays a game of table tennis with Team Canada's Mo Zhang at Canada House in London on Tuesday, June 5, 2012.

  • Whaddya Mean It Doesn't Fit?

    Prime Minister Stephen Harper tries on an old hockey helmet at he tours the Yukon's Hockey History exhibit at the McBride Museum in Whitehorse, Yukon on Thursday, August 25, 2011.

  • Goooaaaaallll!

    Stephen Harper, his son Ben, and Wayne Gretzky watch the men's ice hockey team's gold medal game at the 2010 Winter Olympics in Vancouver. Source: <a href="http://www.flickr.com/photos/pmharper/8457917081/in/photostream" target="_blank">Flickr</a>

  • Who Said Politics Can't Be Fun?

    Stephen Harper and his son Ben hit balloons into the crowd after his speech at the party's three-day policy convention in Montreal on Friday March 18, 2005.

  • Jam Sesh

    Prime Minister Stephen Harper and Jamie Robinson (guitar) play along with Blue Rodeo's front man Jim Cuddy, and recording artist Jimmy Rankin as they belt out a tune during a Juno Awards reception at 24, Sussex March 31, 2012. Source: <a href="http://www.pm.gc.ca/eng/media_gallery.asp?media_category_id=2099&media_category_typ_id=6#cont" target="_blank">Pm.gc.ca</a>

  • Party Politics

    Prime Minister Stephen Harper, looks up from dishing out pancakes at Stampede breakfast in Calgary, Alta., Sunday, July 10, 2011.

  • I Spy Something Cute

    Stephen Harper welcomes two Chinese pandas at Toronto's Pearson Airport on March 25, 2013. Source: <a href="http://www.flickr.com/photos/pmharper/8588948719/in/photostream" target="_blank">Flickr</a>

  • Flashback

    A young Stephen Harper.

  • Just Smile And Back Away Slowly

    Clowns ham it up with Prime Minister Stephen Harper at the IAAF World Junior Championships in Moncton, New Brunswick. July 19, 2010. Source: <a href="http://www.pm.gc.ca/eng/media_gallery.asp?media_category_id=1037&media_category_typ_id=6#cont" target="_blank">Pm.gc.ca</a>

  • Hats Off

    Prime Minister Stephen Harper, left, throws Senator Gerry St. Germain's cowboy hat into the crowd after presenting him with a new one as his wife Margaret St. Germain, right, laughs during a barbecue at St. Germain's ranch in Surrey, B.C., on Monday August 6, 2012.

  • Thumbs Up, Up And Away

    Prime Minister Stephen Harper gives the thumbs up from the cockpit of his campaign plane as he arrives in Ottawa,Tuesday May 3, 2011.

  • He's A Belieber

    Stephen Harper presents Justin Bieber with a Diamond Jubilee Medal on Nov. 23, 2012. Source: <a href="http://www.flickr.com/photos/pmharper/8212520594/in/photostream" target="_blank">Flickr</a>

  • I'm With Him

    Stephen Harper and Wayne Gretzky, joined by students on an outdoor ice rink in Saskatoon on Feb. 5, 2010. Source: <a href="http://on.fb.me/ZTlKy6" target="_blank"> Facebook</a>

  • Shhh... This Is The Best Part

    Stephen Harper, wife Laureen and Suraksha, Grade 10, visit an IMAX theatre in Bangalore, India on Nov. 8, 2012.

  • Umm... This Is My Costume

    Prime Minister Stephen Harper poses for a photograph with Halloween trick-or-treaters at his official residence in Ottawa, Wednesday, October 31, 2012.

  • Is It Cold, Or Is It Just Me?

    Prime Minister Stephen Harper bundles up in a parka as he tours Frobisher Bay in Iqaluit, Nunavut on Thursday, February 23, 2012.

  • One Of Harper's Many Hats

    Canada's Prime Minister Stephen Harper adjusts his hat prior to the arrival of Britain's Prince William and his wife Catherine, Duchess of Cambridge, for the official start of the Calgary Stampede parade in Calgary, Alberta, July 8, 2011.

  • D'awww

    Prime Minister Stephen Harper and his wife Laureen play with some furry friends at the official opening of the new Ottawa Humane Society facility on July 6, 2011. Source: <a href="http://www.pm.gc.ca/eng/media_gallery.asp?media_category_id=1724&media_category_typ_id=6#cont" target="_blank">Pm.gc.ca</a>

  • Omigod, So Cute

    Met Batisse X, official mascot of the Royal 22nd Regiment, prior to welcoming French PM Jean-Marc Ayrault to Ottawa. Source: <a href="http://www.flickr.com/photos/pmharper/8554783327/in/photostream" target="_blank">Flickr</a>

  • I Can Totally Take You

    Prime Minister Stephen Harper receives a cricket lesson from Ankur Biswas, cricket team captain, at the Bishop Cotton Boys School. Source: <a href="http://on.fb.me/12OffwT" target="_blank">Facebook</a>

  • Mush!

    Prime Minister Stephen Harper drives a dog sled after meeting mushing teams at the Arctic Winter Games in Yellowknife, N.W.T., Monday, March 10, 2008.

  • A Very Harper Holiday

  • Hanging With The Golden Girls

    Stephen Harper meets Canada's women's hockey team, gold medal winners at the 2010 Winter Olympics in Vancouver. Source: <a href="http://on.fb.me/17v6qKa" target="_blank">Facebook</a>

  • Tough Cookie

    Prime Minister Stephen Harper and his wife Laureen, left, make cookies with 10-year-old brain cancer survivor Baxton Wacholtz, right, and his mom Michelle, of Telkwa, B.C., during a photo opportunity at Ronald McDonald House in Vancouver, B.C., on Tuesday August 7, 2012.

  • Does This Mean I'm In The Band?

    Canadian musician Jens Lindemann visits Stephen Harper before a concert. "His blue trumpet reminded me of Sgt. Pepper," according to Harper. Source: <a href="http://www.flickr.com/photos/pmharper/8519328992/in/photostream" target="_blank">Flickr</a>

  • Stanley's Not Going To Be Happy About This

    Met with Constable Dan Allen of the Child at Risk Response Team (and Cagney the dog) while in Calgary. Source: <a href="http://www.flickr.com/photos/pmharper/8640427193/in/photostream" target="_blank">Flickr</a>

  • Say, 'Happy Halloween!'

    Prime Minister Stephen Harper points out the camera to baby Grayson, dressed up as a giraffe, during his first time trick-or-treating at 24 Sussex. Source: <a href="http://on.fb.me/10ppG5w" target="_blank">Facebook</a>

  • Bear Hug

    Stephen Harper hugs his daughter Rachel Hugging Rachel as results come in after the 2011 election. Source: <a href="http://on.fb.me/15WI2TY" target="_blank">Facebook</a>