OTTAWA, Nov. 28 (Xinhua) -- Canada's opposition parties are determined to bring down the Conservative government and are negotiating forming a coalition Friday, after they rejected Prime Minister Stephen Harper's economic stimulus plan.

    The government tabled its fiscal update Thursday, promising spending cut measures to overcome the economic crisis, but falling short of a stimulus package to support the struggling industries. All three opposition parties immediately denounced the plan.

    The largest opposition group, the Liberals, has drafted a non-confidence motion and could table it to the House of Commons Monday, which will bring down the newly-formed government.

    "In light of the government's failure to recognize the seriousness of Canada's economic situation and its failure in particular to present any credible plan to stimulate the Canadian economy ... this House has lost confidence in this government and is of the opinion that a viable alternative government can be formed," reads the motions.

    Former Liberal Prime Minister Jean Chretien (1993-2003) and former New Democratic Party leader Ed Broadbent (1975-1989) were reportedly negotiating a deal to form a coalition government, with the Bloc Quebecois supporting them from outside in the parliament.

    The government economic plan could go to a confidence vote Monday evening, if it fails, the Conservatives would have to step down and Prime Minister Stephen Harper will go to governor general to ask for dissolving the parliament and calling an election.

    Since the last election just happened in October, the governor general may decide to let the opposition coalition to run the government.