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This seems like a really bad standard to apply to the president. I'd argue that morally there are two relevant factors when it comes to finding someone guilty: the damage that would be done to others by failing to punish the perpetrator, and the damage that would be done to the alleged perpetrator by punishing them. We choose different standards depending on those two factors. For example, in civil cases, someone specific has lost something and someone else has gained at their expense. And you're not seeking to imprison someone, but to take away some of their wealth. So we pick a standard of evidence (preponderance of the evidence) that's lower than in criminal cases (with a very high injury to the perpetrator and typically lower injury to the community).
In contrast, an impeachment is not a prison sentence. It would injure a president only insofar as that president would no longer keep the most prestigious title and position of power in American society. And failing to impeach for serious corruption or crimes (say, if a president were conspiring with China to weaken America's standing overseas) could be catastrophic. So I think a much weaker presumption of innocence is in order.
Flynn was then charged for lying when he plead guilty, because ht wasn't actually guilty. Seriously. This is a Kafka trap.
On top of that, it's now clear Sullivan was getting e-mail, exparte, and ENTERING THEM into evidence!!!