Sen. John McCainJohn McCainFather of slain Navy SEAL wants investigation A stronger NATO for a safer world Drug importation won't save dollars or lives MORE (R-Ariz.) joked that it would be a tough decision to vote for Sen. Rand PaulRand PaulConquering Trump returns to conservative summit Rand Paul rejects label of 'Trump's most loyal stooge' GOP healthcare plans push health savings account expansion MORE (R-Ky.) over Democrat Hillary ClintonHillary Rodham ClintonHollywood stars make political statements with Oscars fashion Live coverage: Stars get political at Oscars 5 ways politics could steal the show at Oscars 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 RubioTHE MEMO: Trump takes the fight to Congress Rubio says town halls designed for people to 'heckle and scream' At CPAC, Trump lashes out at media 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 CruzTHE MEMO: Trump takes the fight to Congress Brietbart CEO reveals that Trump donors are part owners At CPAC, Trump lashes out at media MORE (R-Texas) and Rep. Justin AmashJustin AmashCongress must reform civil asset forfeiture laws A guide to the committees: House GOP rep pushes back on Trump's tweet about town hall protests 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.