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“He is the one for an open border that is leaving us defenseless," Rand Paul said. Rand Paul nicks Marco Rubio on immigration

Rand Paul swung hard Tuesday at his Senate colleague Marco Rubio, accusing his steadily climbing GOP primary rival of siding with liberals on border security.

“He is the one for an open border that is leaving us defenseless," Paul said during the Republican presidential debate. "Marco has more of an allegiance to Chuck Schumer and to the liberals than he does to conservative policy.”

Rubio hit back, arguing that he simply opposed a bill that would've blocked tourism indiscriminately rather than focusing on security threats and he accused Paul of opposing tools for the intelligence community to root out terrorism.

Chris Christie saw an opening, saying that "nobody cares" about the bickering between senators who are "one of a hundred."