Why doesn't bob Lazar testify under oath to congress?

Bob seems very eager for publicity, which is fine. Podcasts, documentaries, etc But there's currently a congressional investigation of an *illegally run* UAP reverse engineering program. His testimony could be sworn under oath and therefore added as evidence because he claims to be a first hand witness of working on this *illegally run* program. Rep. Luna said on Joe Rogan a lot of big UFO personalities with alleged first hand experience are avoiding testifying in a SCIF (because of the threa...