OTTAWA -- The Liberals are trying to ensure the Harper government doesn't dodge two contempt-of-Parliament bullets before heading into a federal election.

A Liberal confidence motion is destined to topple the minority Conservative regime on Friday.

It already cites the government for refusing to fully disclose the cost of its tough-on-crime agenda, corporate tax cuts and plans to purchase stealth fighter jets.

Now, Liberals are thinking of amending the motion to include reference to International Co-operation Minister Bev Oda being in contempt for misleading Parliament.

An opposition-dominated committee is supposed to report to the Commons on Friday into whether Oda should be found in contempt.

But opposition MPs say Tory members are filibustering the committee to avoid a formal contempt citation against the minister.

No government or minister in Canada — or the Commonwealth — has ever before been formally cited for contempt.