Conservatives once had a 25-point lead ahead of Canada's next election. That lead has since vanished. Experts say Trump's actions may changed the course of the election.

Here is a quick breakdown of how Canada’s elections work: Voters cast their ballots at polling stations in their local cities and towns. Some vote early in advance polls, but most show up on the day of the election. On the ballot are the names of candidates running for each federal party in that area - known as a ‘riding’.

The attacks by the U.S. president revive Mark Carney's Liberal Party, which just a few months ago was trailing by 25 points in the polls. Canada is holding federal elections today. Perhaps the most important in its modern history,