By Promit Mukherjee and Rod Nickel PORT MOODY, British Columbia (Reuters) -Donald Trump re-emerged as a factor in Canada's election campaign on Thursday, days before a vote that Prime Minister Mark Carney says will determine how Ottawa can best stand up to the U.

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 is heading into federal elections, where Prime Minister Mark Carney is vying for a chance to continue leading the country, as tensions over trade grow with the US.