President Donald Trump threatened Canada with a 50% tariff on all aircraft sold in the U.S., escalating tensions in his ongoing trade dispute with the country.

The move targets Canada for allegedly refusing to certify jets from Gulfstream Aerospace and includes decertifying Bombardier’s Global Express business jets, a move that would affect 150 aircraft registered in the U.S.

Bombardier responded that its planes meet FAA standards and emphasized the potential impact on air traffic if the issue is not resolved.

Aviation experts said decertification for trade reasons would be unprecedented, calling Trump’s threat a political maneuver rather than a safety issue, the AP has reported.

The dispute comes amid broader tensions over trade, with Canada seeking to diversify its economic relationships and Trump continuing to pressure the country on multiple fronts, including previous tariffs and criticism of Canada’s deals with China.