The Border Patrol chief has been forced out a day after President Donald Trump announced an ambitious plan to build a wall at the Mexican border and hire 5,000 Border Patrol agents, a U.S. official told The Associated Press on Thursday. Mark Morgan told senior Border Patrol agents about his ouster during a brief video conference on Thursday morning, saying he was asked to leave and that he decided to resign rather than fight the request, according to the official, who was on the call.