German Chancellor Angela Merkel on Sunday warned US President Donald Trump against “destroying” the United Nations. “I believe that destroying something without having developed something new is extremely dangerous,” Merkel said at a regional election campaign event in Bavaria. The veteran leader — a close ally of Trump’s bugbear Barack Obama while he was president — added that she believed multilateralism was the solution to many of the world’s problems. […] In his second appearance before the UN’s annual gathering last week, Trump told the General Assembly that he and his administration “reject the ideology of globalism, and we embrace...