Leaked audio from a private event has reportedly captured the US vice-president, JD Vance, mocking Canada for apparently capitulating in a trade deal and taunting the prime minister, Mark Carney, for trying to “out-tough” Donald Trump.

The recording, which was reportedly made at a fundraiser and shared with the Canadian Press, comes in the last stretch of a difficult negotiation in which the US president has threatened to impose 50% tariffs on Canada.