On the Senate floor Wednesday afternoon, Arizona Republican John McCain accused Sen. Rand Paul of Kentucky of "working for Vladimir Putin" for voting against a resolution to allow the Serbian breakaway territory of Montenegro join the NATO alliance.



"If there's objection, you are achieving the objectives of Vladimir Putin," McCain warned. "If they object, they are now carrying out the desires and ambitions of Vladimir Putin, and I do not say that lightly."



Sen. Paul objected, but declined to comment and left the Senate, prompting McCain to say: "That is really remarkable... A senator, blocking a treaty that is supported by the overwhelming number, perhaps 98 at least of his colleagues, would come to the floor and object, and walk away."



"The only conclusion you can draw when he walks away is he has no argument to be made," McCain explained.



"The senator from Kentucky is now working for Vladimir Putin," McCain aded.



On ABC's 'This Week' last month, Sen. Paul said that Sen. McCain "has been wrong on just about everything over the last four decades" and that "we're very lucky John McCain is not in charge because I think we would be in perpetual war."