U.S. Sen. John McCain blasted fellow Republican Rand Paul on the Senate floor this morning for his 13-hour filibuster to block John Brennan's confirmation as CIA Director.

"Calm down, Senator," McCain said, in an apostrophe to Paul. "The U.S. government cannot randomly target U.S. citizens."

In his filibuster Wednesday, Paul criticized the White House over its drone policies, and for refusing to rule out military strikes against U.S. citizens on American soil.

McCain, a staunch foreign policy hawk, said Thursday that Paul's warnings that the U.S. could target "Jane Fonda" or "people in cafes" bring the debate into the "realm of the ridiculous."

"If Mr. Paul wants to be taken seriously he needs to do more than pull political stunts that fire up impressionable libertarian kids," McCain said, adding: "I don't think what happened yesterday is helpful to the American people."

Sen. Lindsey Graham (R-S.C.) echoed these criticisms, adding that he was "disappointed" in the 13 Republican Senators who supported Paul's filibuster last night.

Graham later told reporters that he will vote to confirm Brennan as a result of the filibuster.