U.S. Sen. Lindsey Graham says he won’t vote for, or support, presumptive Republican presidential nominee Donald J. Trump.

Former Florida Gov. Jeb Bush echoes that view. Bush says Trump is unfit for the presidency and won’t get his vote.

These two men have something in common apart from their mutual distrust and loathing of the guy who beat them in the GOP presidential primary.

They both signed the “pledge” to support the Republican presidential nominee — no matter who he or she is.

Didn’t former New York Gov. George Pataki say just recently that he won’t support Trump?

To be sure, we need to hear from a lot of other former Republican candidates. Sen. Ted Cruz signed the pledge. His running mate — for all of nine days — Carly Fiorina signed it, too. The last candidate to drop out, Ohio Gov. John Kasich, also has made his feelings quite clear about Trump: He can’t stand him, either — and, oh yes, he signed the pledge, too.

Ben Carson’s already on board with Trump. So is former Texas Gov. Rick Perry and New Jersey Gov. Chris Christie.

We need to hear from the rest of the once-huge field.

This is why such phony pledges get candidates in trouble.

I happen to respect Sen. Graham and Gov. Bush very much. I believe they’re standing on a principle. They do not want their party represented by a huckster, which is what they’ve determined Trump to be.

Interestingly, the only GOP candidate to refused initially to sign the pledge was Donald Trump, who later signed it … and then recanted his pledge.

Still, the others did put their names on that pledge.

I guess Graham and Bush can take it all back. Politicians do it all the time.