Liberal interim leader Bob Rae is telling HBO's Bill Maher that Canada's seal hunt is being singled out unfairly and celebrities should find more worthy causes to fight for.

Maher wrote to Rae earlier this month telling him he was disappointed the Liberal Party isn't supporting Senator Mac Harb's effort to end the "commercial baby seal slaughter." Maher said he expected such behaviour from Conservatives, "but the liberals? (sic) I had hoped for more."

In a letter, dated July 11, Rae doesn't take up the "baby seal" comment but tells Maher the traditional seal hunt is a culturally important industry to thousands of Canadians. The population is abundant, he writes, with the harp seal herd estimated to be in excess of nine million animals.

Rae respectfully tells Maher he and his famous friends should find another pet project.

"I have always found it interesting that other forms of hunting, and the slaughter of many animals for human consumption around the world, have not aroused the attention of well known celebrities," Rae writes. "Without challenging for a minute the good intentions of anyone, it is hard not to feel that that this particular hunt is being singled out unfairly."

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 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)