U.S. President-elect Donald Trump has vowed to get Mexico to do more to stop the flow north of fentanyl, which has killed hundreds of thousands of Americans. He has threatened to impose steep tariffs if he does not see curbs on fentanyl trafficking and illegal migration. Mexican authorities said on Wednesday they had apprehended over 5,200 migrants across the country on Tuesday, signaling a further ramp-up in enforcement aimed at stopping migrants from reaching the U.S. border.