It would be nice if he did speak out.
“Trump says he’s heard ‘interesting’ things about UFO mecca Roswell”
https://nypost.com/2020/06/18/trump-says-he-heard-interesting-things-about-ufo-mecca-roswell/
You don’t know the half of it about Oumuamua. Why were SDO, SOHO and Solar Probe B all “down for maintenance” at the time, although amateur radio astronomers clearly detected transmissions continuing from them?