"I said that all of the individual expenses of all senators would be looked at and those who were not following the rules would be held accountable. That is exactly what has happened in that and the case of every single senator," he said to applause.

When asked about the matter on Tuesday, Liberal Leader Justin Trudeau said in French that developments at Duffy's trial prove that Canadians cannot trust Harper to tell the truth.

"I expect that when we learn more about Ms. Wallin it will be exactly the same thing," Trudeau said. "The prime minister is not worthy of our trust."