Sen. John McCainJohn McCainTrump’s feud with the press in the spotlight Republicans play clean up on Trump's foreign policy Graham: Free press and independent judiciary are worth fighting for MORE (R-Ariz.) joked that it would be a tough decision to vote for Sen. Rand PaulRand PaulTrump’s feud with the press in the spotlight Rand Paul: We’re very lucky John McCain’s not in charge Rand Paul: John Bolton would be a 'bad choice' for national security adviser MORE (R-Ky.) over Democrat Hillary ClintonHillary Rodham ClintonChelsea Clinton attends Muslim solidarity rally in NYC Congressional Black Caucus expected to meet with Trump soon Why liberals should accept a conservative carbon tax plan MORE if both won their party’s presidential nomination in 2016.

“It’s gonna be a tough choice,” McCain said with a laugh when asked about it in an interview with the New Republic published Tuesday. 

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McCain clarified that he believes Paul is trying to expand the GOP brand, and that he represents the same libertarian-leaning part of the party once represented by his father, former Rep. Ron Paul (R-Texas).

However, McCain heaped praise on another prospective Republican presidential candidate in 2016, Sen. Marco RubioMarco RubioRepublicans play clean up on Trump's foreign policy Top Dem: GOP is terrified of Trump McConnell on Trump: 'I'm not a fan of the daily tweets' MORE (Fla.). He called Rubio a “valuable candidate for president” and said his push for immigration reform will not impede his presidential prospects, harkening back to his own failed bid in 2008.

“He has a bright future in the party,” he said. “He is a valuable candidate for president. Some people say this will set him back, but remember, I got the nomination of the party after failing on immigration in 2007.”

McCain has had numerous dustups this year with the Tea Party-fueled wing of the GOP this year. He opposed Paul’s filibuster of CIA director John Brennan’s nomination over the U.S. use of drones, and described Paul, Sen. Ted CruzTed CruzTrump to interview four candidates for national security adviser Milo Yiannopoulos to speak at CPAC Reports: Petraeus off the list, Trump down to three candidates to replace Flynn MORE (R-Texas) and Rep. Justin AmashJustin AmashSome GOP lawmakers want entitlement reform in next budget Republicans dismiss growing protests at home GOP lawmaker proposes abolishing Department of Education MORE (R-Mich.) as “wacko birds.”

In the interview, he said the isolationist wing of the GOP has been strengthened by the recession.

“There was an isolationist wing that fought against Reagan. And now the bad economy has exacerbated what has always been out there,” he said.

McCain attempted to separate Paul’s brand of conservatism from his former running mate in 2008, Sarah Palin, arguing her message was positive.

“They came to power to keep things from getting done,” McCain said.

Reflecting on his own legacy, he said he has had the best ride, but still expressed some regret from his failed 2008 bid for president.

“Am I happy? I’d like to be president of the United States,” he said.