Actually, Watergate aside from taking down a Republican President was small beer compared to what occurred in previous democrat administrations and all democrat administrations since. I mean what is more of a heinous act, the sale of military secrets by the clintons and their taking millions of dollars from our enemies both during and after his presidency and her senate and secretary of state terms, the obama arming of and strengthening muslim enemies and wilful sacrifice of American soldiers? Nixon was a piker in comparison and as far as Trump, I have still seen nor heard anything but accusations and innuendo.
I could be wrong but I believe every President since it became technologically possible has recorded what occurs in their office and on the phone and all of them have surely tried to use the offices influence.