President Donald Trump on Thursday vowed to look into reports of multiple U.S. scientists who have either died or gone missing in recent months. “I hope it’s random, but we’re going to know in the next week and a half,” he told reporters, adding that “I just left a meeting on that subject.” The reports, he added, are serious, because “some of them were very important people, and we’re going to look at it over the next short period.” The president provided an update a day after White House press secretary Karoline Leavitt told reporters that the Trump administration is investigating. A reporter asked Leavitt about 10 scientists who died or disappeared over the past several years, with some of them having access to nuclear or aerospace material....