U.S. President Donald Trump’s trade war and annexation threats have upended Canada’s election and dramatically improved the fortunes of the Liberal Party, which could win a fourth consecutive term in power next week.

Canada’s Pierre Poilievre seemed to be cruising toward victory in the next election. His Conservative Party was polling around 20 percentage points ahead of Justin Trudeau’s Liberals because of growing voter frustration around political scandals and rising housing costs.

There is no fixed term for the Prime Minister in Canada. He or she can hold the office as long as they have the confidence of the majority of the House of Commons. The shortest tenure in Canadian political history was that of Charles Tupper.