WASHINGTON — President Trump said in a Fox News interview broadcast on Sunday that he had found a buyer for the TikTok short-video app, which he described as a group of “very wealthy people” whose identities he will reveal in about two weeks. Trump made the remarks in an interview on Fox News’ “Sunday Morning Futures with Maria Bartiromo” program. He said the deal he is developing would probably need China’s approval to move forward and he predicted Chinese President Xi Jinping would likely...