CNN's Ashley Killough
(CNN) – Could a primary battle already be underway for the 2016 Republican presidential nomination?
Republican Sen. Rand Paul of Kentucky took a swipe at New Jersey Gov. Chris Christie on Friday for his recent attacks against the National Rifle Association. Paul further argued the outspoken governor threw a "tantrum" when he recently criticized lawmakers in Washington over the Superstorm Sandy relief package.
Neither elected official has shot down the idea of running for president in 2016, fueling speculation that both are mulling a White House bid.
In an interview with conservative radio host Laura Ingraham, Paul mentioned Christie as an example of a high-profile Republican who's not standing up for Second Amendment rights in the ongoing gun control debate.
Christie made headlines Thursday for going off about a new NRA political attack ad that makes mention of the president's children. Calling the commercial "reprehensible," Christie said the organization lost credibility with the spot.