Christie, Paul trade barbs over GOP future

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The jab drew a swift counterpunch from Paul, who defended his criticism of National Security Agency programs. 

"Christie worries about the dangers of freedom. I worry about the danger of losing that freedom. Spying without warrants is unconstitutional," he tweeted. 

The feuding between the two men reflects a debate that will be raging in the GOP through 2016, when the party decides on a new standard-bearer.

Read more on The Hill.