In a Wednesday, July 10, 2013, file photo, former New York City Mayor Rudy Giuliani testifies on Capitol Hill in Washington. Giuliani said Sunday, Jan. 12, 2014, that he finds it "pretty darn credible" that New Jersey Gov. Chris Christie didn't know about an apparently politically motivated plan to create traffic jams near the George Washington Bridge. (AP Photo/Jacquelyn Martin, File)
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