TORONTO - Despite a warning from NDP Leader Andrea Horwath that she won't support any new taxes in the upcoming budget, Premier Kathleen Wynne says there'll be a new "revenue stream" for public transit expansion.

Horwath sent Wynne a letter warning that she "will not support any new taxes, tolls or fees that hit middle-class families" in the minority Liberal government's budget.

But Wynne says the Liberals are committed to finding a new way to fund public transit, and will decide by budget time whether that will be increasing the gasoline tax, road tolls or some other levy.

The premier says she wants to work with the opposition parties to get the budget passed, but adds she won't change plans that the Liberals feel are best for Ontarians.

Progressive Conservative Leader Tim Hudak says it's unfortunate that "Wynne sees taxpayers as revenue tools."

Horwath later refused to say if the New Democrats would actually vote against the budget, which would automatically trigger an election.