"There are only losers in a trade war. With our EU partners, we will assess consequences on our industries and agree appropriate response," he tweeted.
Trump imposed the tariffs -- 25 per cent on steel and 10 per cent on aluminium -- despite repeated warnings from the EU and other allies that this could trigger a full-on trade war.
Last Friday, Le Maire warned that any such measures by the US would be "unacceptable" and called for a "strong, coordinated, united response from the EU".
"There are certain countries which practice dumping and other subsidies which distort global trade," he said, in an indirect reference to China. "The American authorities know that perfectly well, and it is this that they should be addressing, not anything else."
The White House said today that countries concerned by the new tariffs could speak to the US in order to negotiate possible exemptions.
"I will demand more clarity on this issue in the days to come," she added.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)