I think you are correct, it isn’t cowardice, it’s craven opportunism. He has never wanted Trump to stop the illegal alien inundation.
Paul RINO is a Cheap Labor Express Republican, one of many.
The entire Bush/Romney wing of the party.
It’s also just plain stupid. You can’t win without the base and he just made sure that the millions who nominated Trump will NOT vote downticket for any Republican who ran for cover from the enemedia (btw, if you haven’t seen that before, i claim coinage) in hopes of winning the hearts and minds of those who are so weak in both categories (heart and mind) that they still just can’t decide who to vote for. Stupid, cowardly, treasonous.