Is the U.S. subsidising Canada as Trump often claims?

No. This is a false claim by President Trump. 

Trump is referring to the United States trade deficit with Canada, which is not a subsidy.

The export of needed oil and energy from Canada accounts for much of the trade deficit. A 2025 report by the National Bank of Canada illustrates that, except for Canadian oil and gas exports, America sells more in Canada than Canada sells to the U.S.