Donald Trump has heaped criticism on the former German chancellor Angela Merkel for opening up her country to refugees, telling her successor: “I told her it shouldn’t have happened.” During an appearance with the German chancellor, Friedrich Merz, on Thursday, Trump was asked about the sweeping travel restrictions on 19 countries that he announced the previous day. “We want to keep bad people out of our country … of course, you have a little problem too with some of the people that were allowed into your country,” Trump said to Merz, in an apparent reference to a number of attacks...