If the FBI finds information that he has lied, did the deed, etc. I suspect they will confront him, in private, and he will withdraw. Then, of course, he will also have to defend his current job as he, pretty much, defined his own extremism and side. Two things, I think, that should disqualify him from even keeping his current job.
This is, of course, all speculative - we are going to have to wait for the FBI report to see what happens next.