Ben Sasse of Nebraska. More of these will start to come out in attempt to stop Trump.
Then the GOP would be violating “the pledge” and Mr. Trump would be free to respond. Could be a long night down ticket for the GOP if Trump tells his supporters (half the GOP base) to only vote for those GOPers who endorse him.
I believe there will be leaders that will publicly disavow Trump prior to the convention. If Trump gets the nomination these folks will shut their traps.