Let's see how this plays out, before we get our shorts in a wad needlessly.
There were 7 votes against the first Trump impeachment.
Forget the Senate. That is just the House. 3 Dems voted no and 4 voted present or did not vote. 7 votes.
If we had 7 votes against impeachment, it would never even get to the Senate.
Best procedure is wait for the election, and then ram through impeachment after that.