Sen. John McCainJohn Sidney McCainBudowsky: Trump destroying GOP in 2018, '19, '20 Conservative group cuts ties with Michelle Malkin Democratic debate at Tyler Perry's could miss the mark with black voters MORE (R-Az.) on Tuesday said he won’t be endorsing any Republican presidential contenders until it becomes clear that Sen. Lindsey GrahamLindsey Olin GrahamGraham: Report on alleged surveillance abuse in 2016 to be released Dec. 9 McConnell hopes Senate impeachment trial 'not too lengthy a process' Hillicon Valley: Progressives oppose funding bill over surveillance authority | Senators call for 5G security coordinator | Facebook gets questions over location tracking | Louisiana hit by ransomware attack MORE (R-S.C.) is out of the running.

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Speaking to reporters on Capitol Hill, the 2008 Republican presidential nominee was asked if he’d endorse former Florida Gov. Jeb Bush (R).

“No, no, no, of course not,” McCain said. “I’m certainly ready to listen to people but obviously Lindsey Graham and I, if he decides to run, he’s my closest friend.”

Graham has floated the idea of running for president if Republican hawks aren’t represented in what’s expected to be a large field of candidates. McCain and Graham are often at odds with Sen. Rand PaulRandal (Rand) Howard PaulSenate scraps plan to force second stopgap vote ahead of shutdown On The Money: Senate scraps plan to force second shutdown vote | Trump tax breaks for low-income neighborhoods draw scrutiny | McConnell rips House Dems for holding up trade deal Democratic debate at Tyler Perry's could miss the mark with black voters MORE (R-Ky.), a likely GOP contender, and others from the non-interventionist wing of the party.

“I don’t know what [Graham] is going to do, I really don’t,” McCain added.

McCain has met with Bush and advised him on how to gear up for a run. The Arizona Republican said his conversation with Bush was limited to “the ins-and-outs and mechanics of campaigning.”

Bush announced earlier in the day he was “actively exploring” a bid for the Republican nomination and would launch a leadership PAC.