In an interview with the New Republic, Sen. John McCain (R-Ariz.) acknowledges, laughingly, that a 2016 presidential race between former Secretary of State Hillary Rodham Clinton and Sen. Rand Paul (R-Ky.) would be "a tough choice" for him.

"When Hillary Clinton v. Rand Paul occurs in 2016, I guess you are going to have to decide who to vote for, huh?" TNR asked.

McCain responded with a chuckle: "It's gonna be a tough choice."