Tea Party favorite Rand Paul, Kentucky Senator and son of GOP presidential candidate Ron Paul, single-handedly thwarted an amendment proposed by Sen. Marco Rubio (R-Fla.) drafted to advance Georgia’s application for NATO membership.

In recent months, Paul, the constitutionalist, libertarian-leaning Senator has underscored his Republican credentials, sponsoring a range of GOP-led legislation, including a jobs bill with Sen. John McCain (R-Ariz.), a bill that would prioritize smaller harbors for dredging work with Sen. Lindsey Graham (R-S.C.), and with his fellow Kentuckian, Sen. Mitch McConnell (R-Ky.), a bill that would repeal net neutrality.

But last week, Paul’s amicable collaboration with his Republican colleagues came to a halt, as he sparred with Sen. Rubio, a fellow Tea Party favorite, over a foreign policy proposal critics say could have dealt a terminal blow to U.S.-Russian relations. In a bipartisan effort, the amendment "called for the President to lead a diplomatic effort to get approval of Georgia’s Membership Action Plan during the upcoming NATO summit in Chicago," said a Rubio spokesman.

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Photo of Rand Paul: AP Images