If he's doing his job, he has vetted his sources.
At any rate, his sources will soon have to face the music when Congress either calls them to testify or issues them a subpoena if they refuse.
People behind the scenes in Congress and those close to the witnesses who testified say that we are now in a completely new era as regards UFO/UAP's.
I guess we regular folk will have to wait and see.
Trump thought he knew his sources as well. It's been a long hard road he's been traveling to find out how wrong he was, that people he thought he could trust were the first to stick a knife into his back.