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.

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.

An unusual consensus around energy policy has emerged in the campaign ahead of Canada's April 28 election, with the two main candidates both promising to fast track energy projects to diversify oil exports away from the United States.