Sen. Rand PaulRand PaulThe Hill's 12:30 Report This week: GOP picks up the pieces after healthcare defeat Trump, GOP fumble chance to govern MORE (R-Ky.) on Thursday shot back at Sen. John McCainJohn McCainCheney: Russian election interference could be ‘act of war’ Grassley wants details on firm tied to controversial Trump dossier Republicans giving Univision the cold shoulder: report MORE after the Arizona Republican accused Paul of working for Russian President Vladimir Putin.
"I think he makes a really, really strong case for term limits," Paul said on MSNBC's "Morning Joe." "I think maybe he's past his prime; I think maybe he's gotten a little bit unhinged."
McCain made the claims Wednesday from the Senate floor.
"The senator from Kentucky is now working for Vladimir Putin."
"We currently have ... combat troops in about six nations. We have troops actively just stationed in probably a couple dozen others," he said.
"We have a $20 trillion debt."
Paul said McCain's foreign policy would "greatly endanger" the country and "greatly overextend us."
"And there has to be the thought whether or not it's in our national interest to pledge to get involved with a war if Montenegro has an altercation with anyone," he said.
"Another argument is that, when you ask the people of Montenegro, only about 40 percent or slightly less are actually in favor of this," he said, adding there are a lot of considerations.
"But to call someone somehow an enemy of the state or a traitor might be considered by most reasonable people to be a little over the top."