Manchin. You bet he will. He will vote as close to GOP as he can if he thinks he is going to keep his seat.
He is up for re election in 2018.
BTW WV and WY were the two highest vote percents, for Trump. Coal country didn't like Hillary at all.
It wouldn't surprise me if Manchin switched parties. It would be prudent.
Just say the democrat party left him. Play the video clip of Bill Clinton on immigration in 1995, with Trump's position.