Sen. John McCainJohn Sidney McCainThe Biden-Harris train wreck may have its savior: 2024 GOP nominee Donald Trump Kelly raises million in third quarter Legislative limbo — how low can they go? MORE (R-Ariz.) joked that it would be a tough decision to vote for Sen. Rand PaulRandal (Rand) Howard PaulDemocrats fret as longshot candidates pull money, attention Journalist Dave Levinthal discusses 'uptick' in congressional stock trade violations McConnell vows GOP won't help raise debt ceiling in December after Schumer 'tantrum' MORE (R-Ky.) over Democrat Hillary ClintonHillary Diane Rodham ClintonTrump criticizes Justice for restoring McCabe's benefits Biden sends 'best wishes' to Clinton following hospitalization The Hill's Morning Report - Presented by Altria - Jan. 6 panel flexes its muscle 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 Antonio RubioDefense & National Security — Military starts giving guidance on COVID-19 vaccine refusals Blinken pressed to fill empty post overseeing 'Havana syndrome' Tim Scott takes in .3 million in third quarter 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 CruzRafael (Ted) Edward CruzOcasio-Cortez goes indoor skydiving for her birthday GOP rallies around Manchin, Sinema McConnell gets GOP wake-up call MORE (R-Texas) and Rep. Justin AmashJustin AmashDemocrats defend Afghan withdrawal amid Taliban advance Vietnam shadow hangs over Biden decision on Afghanistan Kamala Harris and our shameless politics 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.