The Canadian prime minister has expelled an MP from the ruling Liberal Party because of her outspoken criticism of US President George Bush.
Mr Martin said Ms Parrish's behaviour was "unacceptable"
On Wednesday the MP, Carolyn Parrish, appeared on a TV comedy show, in which she stamped on an effigy of Mr Bush.
Paul Martin acknowledged Ms Parrish's right to express her views frankly, but he said he could not tolerate behaviour that "demeans and disrespects others".
Ms Parrish will now sit as an independent in the Canadian parliament.
Correspondents say her dismissal further weakens the position of the Liberal Party, which returned to power in June but with a minority in parliament.
The Liberals and their New Democrat allies have fewer MPs than the combined opposition.
Ms Parrish, who represents a district near Toronto, has made several outspoken comments in the past.
She has called supporters of the US ballistic missile defence plan the "coalition of the idiots" and this month described Mr Bush as "war-like".
She also told a reporter that she "wouldn't shed a tear " if Mr Martin were to lose the next election, and that his team "can all go to hell".
"It is unacceptable. There are better, more civil and more effective ways to make your case than those she has chosen," Mr Martin said on Thursday.
Ms Parrish was quoted by the Canadian media as saying that she had no regrets about her statements.
President Bush is due to visit to Canada at the end of the month.