Quoting myself from another thread:
As of now, zero out of two impeachments of a President have resulted in conviction and removal (Nixon quit before he could be impeached). Even though we like to say it’s a political process and you don’t really need the kind of evidence that will hold up in a “real” court, the scant record so far with Presidents is the House may reach for whatever they can hang it on, but Senators are loath to sack a President unless you got yourself something really worth the potential fallout.
But at the same time, the fact that it IS political means I don’t expect the congressional GOP will lend the votes unless you have a rock solid slam dunk of a case, perhaps involving dead girls AND live boys, shootings in broad daylight on 5th Avenue and inviting Putin to reannex the Aleutians, with multiple eyewitnesses and a sworn confession.
More seriously, the congressional GOP would want to be able to go home and say “look we had this clear convincing evidence of real crimes, this could not stand, come on the new POTUS is Pence, it’s going to be OK”.