Angst
Rambling and inconsistent
Until they are under oath in court. Then they'll go:
There is a nonzero chance we either made this up, or it's that thing.
What thing?
You know, when you hear someone say something and provide that as evidence.
Hearsay?
Yeah, that's the one.
To be fair, hearsay does have some say in court as it is a form of evidence. It's just not at all substantial on its own for a court case; it's something peripherally used to bolster already strong arguments.
(EDIT: Not that your post is denying this, I just want to get it straight because a lot of people misunderstand what evidence means when told that hearsay is a form of evidence.)
In this case, most of the Trump "proof" is indeed only hearsay, if not hearsay of hearsay, which is a ridiculous situation to have 70% of his voter base support, and very worrying.