This supports what I've written in the past, and even said only last night to a friend -- while I think it highly likely that Trump would not get convicted by the Republican Senate if he's impeached, I am not remotely as convinced by most pundits, elected officials and people in general that this is a "given." What I've said is that as highly likely as it is, and the way I would bet (right now) if forced to...we don't know the evidence yet. And if the evidence is SO blatant, SO damning, SO harmful that it can't be ignored (which this Ukraine revelation is leading to) -- and could even be damaging to a senators career (especially with an election in November, 2020) by voting to acquit and seem to be protecting a criminal or even putting America at risk -- then it is not unreasonable to think that there could be enough Republican senators (and only 20 are needed out of 53) who would vote to convict.
I'm not saying this is likely. It isn't. But we don't know the evidence yet, and how deep this will all lead. But what we do know is that all these Republican senators below right now are refusing to defend Trump to the extent that most are refusing to even comment.