From this article:
“We should not play politics. We should not question the will of the Prime Minister to solve the situation or the work that has been done,” Mr. Dion told the Commons. “If I expressed my disregard to the member very strongly, it is because I mean it.”

But yet:
https://www.liberal.ca/statement-by-liberal-party-of-canada-leader-justin-trudeau-on-mohamed-fahmy/  Aug 2015

“The Liberal Party of Canada is extremely disappointed with today’s verdict, and has long called on Stephen Harper to intervene personally on Mr. Fahmy’s behalf. Harper has an obligation to use the full force of the Prime Minister’s Office to help Canadian citizens when they are unjustly imprisoned abroad. His inaction must end today.”


In other words, only the Liberals are allowed to play cheap politics.