A lawyers' group has asked the RCMP to bar former U.S. president George W. Bush from entering Canada, citing torture and war crimes committed in Iraq, Afghanistan and Guantanamo Bay, Cuba.

In a letter to the RCMP war crimes section and copied to Prime Minister Stephen Harper, Liberal Leader Michael Ignatieff and other federal ministers and opposition MPs, the Lawyers Against the War group claims that Bush is "inadmissible to Canada . . . because of overwhelming evidence that he has committed, outside Canada, torture and other offences" as detailed in Canada's War Crimes Act.

Bush is expected to visit Canada on March 17, to give a speech in Calgary as a guest of the city's chamber of commerce.

The letter, dated Wednesday, asks the Mounties to "begin an investigation of George W. Bush for aiding, abetting and counselling torture between Nov. 13, 2001, and November 2008 at Guantanamo Bay prison in Cuba, Abu Ghraib prison in Iraq, Bagram prison in Afghanistan, and other places."

It also asks the prime minister, attorney general and ministers of immigration and public safety to ban Bush for heading an administration that "engaged in torture and other war crimes against humanity."

The group offers to provide evidence of incidents of torture.

This isn't the first time the group has protested against Bush.

In 2005, a B.C. Supreme Court judge rejected their attempt to put the then-U.S. president on trial for war crimes.