"All politicians lie." This is a stupid thought terminating cliche Trump supporters endlessly repeat because in fact Trump lies far more than any politician I have ever seen in my 49 years of life. He lies so much I'm not even sure he can tell the difference between his lies and reality.

"What makes you think this is the Trump administration lying about fraud"

Because they lie constantly about absolutely everything.

"what kind of Valid Evidence would convince you one way or the other?"

Evidence that comes from people not involved with destroying USAID.