“There are a lot more sightings than have been made public,” John Ratcliffe, the former director of national intelligence, told Fox News in March. Quite a few of them, he said, “are difficult to explain.”
John Brennan, the former director of the C.I.A., said in a podcast last year that some of the unexplained sightings might be “some type of phenomenon that is the result of something that we don’t yet understand and that could involve some type of activity that some might say constitutes a different form of life.”