Draghi Criticizes Proposed U.S. Tariffs as ECB Signals Tighter Policy

European Central Bank President Mario Draghi said tariffs proposed by President Donald Trump raise questions about the strength of the trans-Atlantic alliance, as the bank signaled a shift toward tighter monetary policy.

Speaking during a news conference Thursday, Mr. Draghi said the immediate impact of the proposed tariffs on steel and aluminum would likely be small, but could be greater if other countries retaliated.

Mr....