At this juncture I think it has become more than obvious that Repugnican politicians in general have no commitment to anything but their own main chance.
Their problem is that the window has closed. If they had had the spine to buck the Trump bandwagon even just a year ago there might have been enough time to build up some plausibility. Now, after an unbroken record of kissing The Trump's ass they'd just look like rats deserting a sinking ship.
Not that even that would deter them if they thought there was any percentage in it for them, but there isn't.