Canadian parties seeks to topple PM

Canada's three opposition parties say they plan to topple the Conservative government this week in a vote on the budget or a no-confidence motion.



The no-confidence vote, due tomorrow, stems from a ruling that the government has acted in contempt of Parliament by failing to disclose spending costs.



A vote on the government's budget plan is expected either today or tomorrow.



A defeat for PM Stephen Harper on either vote would trigger Canada's fourth federal election in seven years.



An election would probably take place between May 2 and 9.