HBO host Bill Maher is again chastising Bob Rae for defending Canada's seal hunt.

The comedian wrote to the interim Liberal leader for a second time on Friday after Rae said Maher and other celebrities should find more worthy causes to fight for.

"It's a shame that since you can't defend the commercial seal slaughter ethically or financially, you instead attack the philanthropy of celebrities involved in many different causes, seals among them," Maher wrote.

"The fact that seals have been killed for hundreds of years is no excuse for continuing to kill them. For thousands of years, people held slaves and treated women and children like property, but tradition is not a justification for cruelty. It's disappointing that Canadian politicians continue to bail out this dying industry even though there are no markets for seal fur now."

Maher goes on to suggest that a government buyout of the industry would be the best solution for seals and sealers.

STORY CONTINUES BELOW LETTER

bill maher bob rae seal hunt

The dust-up between the two men started earlier this month when Maher first wrote to Rae to express his disappointment with the Liberals for not supporting Senator Mac Harb's effort to end the "commercial baby seal slaughter."

Rae responded soon after, defending the industry as an important and sustainable part of Canada's "cultural heritage" and attacking celebrities for focusing on the seal hunt while ignoring other forms of hunting.

According to PETA, a large group of celebrities support Harb's bill. They include: Ellen DeGeneres, Pink, Pamela Anderson, Olivia Munn, Tommy Lee, Dave Navarro, Alicia Silverstone and Megan Park.

The Newfoundland and Labrador government says 70,000 harp seals were killed during this year's commercial seal hunt — nearly twice the number killed last year.

But the expansion of the hunt, as Maher suggests, comes as markets for the pelts are drying up.

In December of last year, the federal government confirmed the world’s largest buyer of Canadian seal products — the Russian Federation — had banned the import of harp seal pelts.

The European Union banned seal imports in 2010, and the federal government has so far failed to deliver on a promise to open the Chinese market to Canadian seal meat.

With files from The Canadian Press

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    The following slideshow contains potentially graphic images.

  • Canadian Seal Hunt

    Seal hunters use a hakapik, a club used for killing seals, to kill a seal near their boat in the Gulf of Saint Lawrence March 31, 2008 near Charlottetown, Canada. (Photo by Joe Raedle/Getty Images)

  • Canadian Seal Hunt

    Seal hunters skin harp seals on an ice floe March 30, 2001 in the Gulf of St. Lawrence in Canada. (Photo by Darren McCollester/Newsmakers)

  • Canadian Seal Hunt

    The bodies of harp seals, roughly twenty days old, lie on an ice floe March 27, 2001 in the Gulf of St. Lawrence in Canada. (Photo by Darren McCollester/Newsmakers)

  • Canadian Seal Hunt

    The carcass of a harp seal, roughly twenty days old, lies on an ice floe March 30, 2001 in the Gulf of St. Lawrence in Canada. (Photo by Darren McCollester/Newsmakers)

  • Canadian Seal Hunt

    The carcass of a harp seal, roughly twenty days old, lies on an ice floe March 30, 2001 in the Gulf of St. Lawrence in Canada. (Photo by Darren McCollester/Newsmakers)

  • Canadian Seal Hunt

    The carcass of a harp seal, roughly twenty days old, lies on an ice floe March 30, 2001 in the Gulf of St. Lawrence in Canada. (Photo by Darren McCollester/Newsmakers)

  • Canadian Seal Hunt

    Seal hunters carry dead seals in their boat in the Gulf of Saint Lawrence March 31, 2008 near Charlottetown, Canada. (Photo by Joe Raedle/Getty Images)

  • Canadian Seal Hunt

    A policeman tries to remove female animal-rights activist Ashley Fruno (R), covered with a body-painting to look like the Canadian flag, during her one-woman anti-sealing protest by People for the Ethical Treatment of Animals (PETA) outside the Canadian embassy in Tokyo on March 24, 2010. (TORU YAMANAKA/AFP/Getty Images)

  • Canadian Seal Hunt

    Animal rights activists, Sir Paul McCartney(R) and then-wife Heather Mills McCartney get up close to a seal pup during a venture onto the ice floes of the Gulf of St-Lawrence before the start of the 2006 seal hunting season in Charlottetown, Prince Edward Island. (DAVID BOILY/AFP/Getty Images)

  • Canadian Seal Hunt

    Members of the organization for the defense of animals AnimalNaturalis protest naked and painted as bloody seals to protest the seal hunt in Canada on March 15, 2010. (Getty)

  • Canadian Seal Hunt

    Members of the organization for the defense of animals AnimalNaturalis protest naked and painted as bloody seals to protest against the seal hunt in Canada on March 15, 2010. (Getty)

  • Canadian Seal Hunt

    Inuit hunter Pitseolak Alainga (L) explains how the Inuit traditionally hunt seal to Canada's Finance Minister Jim Flaherty outside the Nunavut Legislature in Iqaluit, Canada, February 6, 2010. (GEOFF ROBINS/AFP/Getty Images)

  • Canadian Seal Hunt

    An animal-rights activist holds a baseball bat as he stands next to a person wearing a seal costume during a protest against the killing of seals in Canada on March 29, 2010 in Munich, Germany. (Photo by Miguel Villagran/Getty Images)

  • Canadian Seal Hunt

    An animal-rights activist wears a mask depicting the face of a seal during a protest against the killing of seals in Canada on March 29, 2010 in Munich, Germany. (Photo by Miguel Villagran/Getty Images)

  • Canadian Seal Hunt

    People protest in front of the Canadian Consulates, on March 25, 2009 in Nice, south eastern France, to protest against the seal hunt in the Gulf of Saint Lawrence in Canada. (VALERY HACHE/AFP/Getty Images)

  • Canadian Seal Hunt

    Having recently returned from a trip out to the ice floes to collect seal heart valves for scientific research, local butcher and seal hunter, Rejean Vigneau (R) and AN employee (L) prepare seal meat in his meat shop on March 25, 2008 in the Magdalen Islands of Quebec, Canada. (DAVID BOILY/AFP/Getty Images)

  • Canadian Seal Hunt

    The Grim Reaper clubs a mock seal to death during a protest by the animal rights group PETA (People for the Ethical Treatment of Animlas) in Hong Kong, 21 April 2006. (MIKE CLARKE/AFP/Getty Images)