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The foreign policy tussle between Chris Christie and Rand Paul, two likely 2016 Republican presidential contenders, marks the most public flaring of a long-simmering debate between the GOP鈥檚 long-time hawkish bent and the libertarian infusion the party has experienced in the last two election cycles.

When push comes to shove, do Republicans weigh in on the side of national security and foreign intervention or of privacy and greater international detachment? And which path will help grow a political party that even some of its leaders fear faces deep demographic challenges?

Of course, both Senator Paul (R) of Kentucky and New Jersey Governor Christie would argue their path does all those things 鈥� they just strongly disagree about how to proceed.

鈥淭his strain of libertarianism that鈥檚 going through parties right now and making big headlines I think is a very dangerous thought,鈥� Christie said on a panel in Aspen, Colo. on Thursday, .

Later, he continued: 鈥淭he next attack that comes, that kills thousands of Americans as a result, people are going to be looking back on the people having this intellectual debate and wondering whether they put 鈥︹�� before abruptly ending his thought.

In a Facebook post, Paul, who most famously launched an hours-long filibuster over domestic US drone use and who has pushed to cut off foreign aid to many restive Middle East nations, rejoined that 鈥淐hris Christie thinks freedom is dangerous. What's dangerous is a foreign policy that borrows from China to pay people who burn our flag in Egypt.鈥�

Paul鈥檚 political Facebook page was less restrained, calling Christie 鈥淥bama鈥檚 favorite Republican鈥� and wondering if the governor approves of sending weapons to 鈥渁l Qaeda allies鈥� in Syria.

While the tiff is a spot of positioning between two presidential contenders at either end of a particular policy debate, it鈥檚 also an argument that reverberates deep down into the Republican Party.

In Congress, there鈥檚 a stark divide between Team Christie and Team Paul.

Rep. Peter King (R) of New York, a former chairman of the Homeland Security Committee and a veteran foreign policy hawk, said he 鈥渋sn鈥檛 saying no鈥� to a potential presidential run in part because 鈥渨hen I see people like Rand Paul talking about drones killing people out to get a cup of coffee, I don't want that to be the face of the national Republican Party," he .

But the reason Congressman King, a 20-year House veteran, has found himself back in the congressional majority is because of a surge of more Paul-minded reinforcements like Rep. Raul Labrador (R) of Idaho. And those folks want more Rand, not less.

Representative Labrador frequently speaks about adding a libertarian 鈥渇ourth leg鈥� to the traditional three-legged stool of Republican support: evangelicals, fiscal conservatives, and foreign policy hawks.

鈥淚f you do away with any of the legs of that stool, you get rid of an entire coalition,鈥� Labrador . 鈥淲e are concerned about fiscal matters and about civil liberties issues.鈥�

But the relative size and strength of that fourth leg 鈥� and how this debate splits Democrats, too 鈥� was on display Wednesday, when the House took up an amendment to the bill funding the Department of Defense from Rep. Justin Amash (R) of Michigan, the most obstreperous House libertarian.

Representative Amash鈥檚 amendment would have de-funded a National Security Agency program started in the President George W. Bush administration that collects Americans鈥� phone records.

Although House speakers rarely vote, Speaker John Boehner (R) of Ohio voted against the amendment and many House GOP security heavyweights inveighed against it.

While that brought a majority of the GOP conference (134 votes) against the bill, 94 Republicans voted against the party鈥檚 mandarins and for the bill.

And those 94 Republicans were joined by a majority of Democrats in what Labrador jokingly called the 鈥渨ing nut coalition鈥� earlier in the day.

Minority leader Nancy Pelosi (D) of California was among the 83 Democrats who voted against the Amash amendment 鈥� but a majority (111, including the amendment鈥檚 co-sponsor, Michigan Democrat John Conyers) voted for the bill against the wishes of the White House.

Representative Pelosi, who voted against the Patriot Act that authorized the surveillance program during its last renewal, later circulated a letter to Obama saying that despite the fact the amendment was defeated 鈥渋t is clear that concerns remain about the continued implementation of the program in its current form.鈥�

Pelosi鈥檚 letter raises several questions to the administration, including whether the law is being implemented consistent with congressional intent.

But the fact that the 鈥渨ing nut coalition鈥� was able to muscle a vote on an amendment that leadership opposed shows they鈥檙e far from a fringe movement.

Speaker Boehner told reporters he feels 鈥渧ery strongly that the Congress couldn't just avoid the debate. Members wanted to have this debate. I believe 鈥� you all know, I believe in a more open process. And I wanted the House to have this debate,鈥� he said. 鈥淲e did.鈥�

But they certainly didn鈥檛 solve it.