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.

The president avoided predicting who could win the election, but said the US does not need Canada's cars, energy or lumber.

Martha Hall Findlay, a former Suncor Energy executive and Liberal member of parliament who heads the University of Calgary's School of Public Policy, said she is gratified to see the main federal parties recognizing the importance of economic growth in addition to the environment.