Asked by CNN’s Candy Crowley about Paul’s objection to the Obama administration’s surveillance programs, which McCain supports, McCain said Paul got it wrong in the runup to the Boston Marathon bombings.

“Just prior to the Boston bombing, he said the battlefield was no longer in America,” McCain said on CNN’s “State of the Union.” “He’s the only one that voted that Iran must not be … contained in the pursuit of nuclear weapons. I disagree.”

McCain and Paul have found themselves on opposite sides of many foreign policy and terrorism-related issues. After Paul’s 13-hour filibuster of President Obama’s drone program earlier this year, McCain labeled Paul and fellow conservatives — including Sen. Ted Cruz (R-Texas) — “wacko birds.”