Story highlights Lindsey Graham ran a quixotic and short-lived campaign for the GOP presidential nomination

His friend John McCain said he wanted to write him in

(CNN) Faced with two presidential candidates he considers unacceptable, Sen. John McCain is thinking of throwing his support behind one of his best pals.

"I think I might write in Lindsey Graham," McCain said Monday at a debate against his challenger in the Arizona senate race, Rep. Ann Kirkpatrick. "He's an old, good friend of mine and a lot of people like him. The fact is I can't, seriously, I cannot vote for either one."

McCain withdrew his support of Donald Trump over the weekend after a recording surfaced in which the Republican presidential nominee can be heard making vulgar comments about women.

On Tuesday, Trump hit back at the Arizona senator.

"The very foul mouthed Sen. John McCain begged for my support during his primary (I gave he won)," Trump tweeted , "then dropped me over locker room remarks!"

The very foul mouthed Sen. John McCain begged for my support during his primary (I gave, he won), then dropped me over locker room remarks! — Donald J. Trump (@realDonaldTrump) October 11, 2016

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