The United Auto Workers’ decision to endorse Kamala Harris’ presidential run has apparently gotten under the skin of Donald Trump, who has responded by insulting the union’s leader as “a stupid person”.

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Trump’s remarks allude to the harsh 100% tariff he has proposed on imported cars. Economists have warned that such a tariff would raise product costs for Americans, but Trump has insisted on it, saying it reflects how he would prioritize the auto industry if returned to White House in November’s election.

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Fain and the UAW – one of the US’s largest and most diverse labor unions – nonetheless gave their coveted endorsement to the vice-president, saying in a statement that Harris had a “proven track record of delivering for the working class”.