OTTAWA, Dec. 3 (Xinhua) -- Canadian Prime Minister Stephen Harper on Wednesday vowed to take "every legal means" to fight against an opposition plan to replace his Conservative government.

    The Liberal Party and the New Democratic Party (NDP), with the support of Bloc Quebecois, have signed an agreement to oust Harperin a non-confidence vote next Monday and replace him with a coalition government.

    In a televised national address Wednesday night, Harper appealed to Canadians for help, telling them a coalition government would not serve Canada's interest.

    "At a time like this, a coalition with the separatists cannot help Canada. And the opposition does not have the democratic right to impose a coalition with the separatists they promised voters would never happen," he said.

    "This is a pivotal moment in our history. Tonight I pledge to you that Canada's government will use every legal means at our disposal to protect our democracy, to protect our economy and to protect Canada," Harper said in the five-minute speech.

    The oppositions declared the minority Conservative government had lost the confidence of the House of Commons, which they said had not taken effective measures to tackle Canada's economic difficulties.

    They were particularly infuriated by a government plan to slash public funding for politicians and political parties, which will affect the oppositions more seriously than the Conservatives.