QUEBEC--The Quebec Liberals could be left with the unhappy task of propping up their arch-rival, the Parti Quebecois minority government, in a vote on the upcoming budget.

That's because the other opposition party, Francois Legault's Coalition, has sent a signal that it's unlikely to support the budget to be tabled next Tuesday.

Legault says his 19 elected members will all be present to vote against the budget unless it satisfies four conditions: no tax hikes, no delaying the return to a balanced budget, scrap a $200-a-year-health tax as promised in the PQ election platform, and include an economic action plan.

Given the challenge of satisfying all those conditions -- especially in a budget due to be tabled in just a few days -- that leaves slim chances of the Coalition propping up the government.

That could leave one other option: the Liberals.

The official Opposition, which was turfed from power in September, is in the midst of a leadership race and therefore less likely to trigger an election.