There is actually a lot of evidence for some of things that Comey says - Russian interference for example, is proven. As for Trump, well, he way not be Washington corrupt, but he's probably the most corrupt president in history. That's after less than 150 days.
Where's the evidence? People saying it's so doesn't make it so.
Russian interference is proven? It probably happened, but what's the "proof"? A newspaper article of some government official saying it happened isn't proof.