Sen. John McCain John Sidney McCainAnalysis: Biden victory, Democratic sweep would bring biggest boost to economy The Memo: Trump's strengths complicate election picture Mark Kelly: Arizona Senate race winner should be sworn in 'promptly' MORE (R-Ariz.) on Wednesday accused Sen. Rand Paul Randal (Rand) Howard PaulThe Hill's Morning Report - Sponsored by Facebook - Trump previews SCOTUS nominee as 'totally brilliant' Rand Paul says he can't judge 'guilt or innocence' in Breonna Taylor case Overnight Health Care: Health officials tell public to trust in science | Despair at CDC under Trump influence | A new vaccine phase 3 trial starts MORE (R-Ky.) of working for Russian President Vladimir Putin after he objected to a treaty related to Montenegro.

"He has no justification for his objection to having a small nation be part of NATO that is under assault from the Russians," McCain said from the Senate floor.

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

The flashpoint came after McCain asked for unanimous consent to set up a vote on a treaty on Montenegro joining NATO, but Paul objected.

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Under the Senate's rules, any one senator can object to a unanimous consent request.

McCain warned before he asked for consent that any senator who objected was "carrying out the desires and ambitions" of Putin.

Paul argued that the U.S. is already stretched thin militarily.

“Currently, the United States has troops in dozens of countries and is actively fighting in Iraq, Syria, Libya, and Yemen (with the occasional drone strike in Pakistan). In addition, the United States is pledged to defend 28 countries in NATO," he said in a statement.

He added that "it is unwise to expand the monetary and military obligations of the United States given the burden of our $20 trillion debt.”

Under NATO's Article 5, member states agree to defend any NATO country that is threatened by force.