It passed 77-19. That means that 96 voted. 2 of the 4 that didn’t vote were Rubio and Graham. They could argue that their votes would have been meaningless, but in Lindsay Graham’s case, we know he would not have voted to support challenging the president.
Now Rubio has caused potential supporters to have to question his intentions. He could have lied on this vote and voted against it and it would have made no difference. It still would have passed 77-20.
It really makes you wonder what message he was sending by being absent.
Trying to straddle the fence and not offend voters on either side. That would be my guess.