Ms. Merkel has for months openly disagreed with Mr. Trump on issues like trade tariffs. During a speech on Wednesday to the German Parliament, she also said it would be wrong to cancel the nuclear agreement with Iran and called the decision to pull out of the accord “troubling news.”
Mr. Tusk’s tweet, however, was one of the more notable, public denunciations of Mr. Trump’s decision making by a European leader, as a series of moves on trade, Israel and other issues has increasingly put traditional allies at odds with the administration in Washington.
Mr. Trump’s decision last week to abandon the Iran nuclear deal — negotiated by Iran and the United States, Britain, China, France, Germany and Russia — left Europe scrambling to preserve the agreement.
Mr. Tusk called on the European leaders of the countries that signed the agreement — like Prime Minister Theresa May of Britain, Ms. Merkel and President Emmanuel Macron of France, who tried but failed to talk Mr. Trump into not scrapping the deal — to reconfirm their commitment to the accord.
European leaders were also unable to persuade Mr. Trump not to withdraw from the Paris climate agreement, a failure that weakens efforts to combat global warming. And Mr. Trump’s decisions to recognize Jerusalem as Israel’s capital and to move the United States Embassy to the holy city were made despite European opposition.