ByMike Stunson,

Forbes Staff.

European Commission President Ursula von der Leyen called President Donald Trump’s proposed tariffs against European countries supporting Greenland “a mistake,” with other leaders also criticizing Trump’s plan to seize the Denmark-controlled territory.

Von der Leyen said in her special address at the World Economic Forum in Davos, Switzerland on Tuesday that the European response to Trump’s tariffs “unflinching, united and proportional,” pledging her “full solidarity with Greenland and the Kingdom of Denmark.”

Other European leaders spoke critically of the U.S. president, with Belgian Prime Minister Bart De Wever saying during the forum Trump could “make us slaves” unless they take action, Politico reported.