Washington (CNN) Former New Jersey Gov. Chris Christie argued that the Southern District of New York -- and not the special counsel's Russia investigation -- presents more of a "problem and a threat" to President Donald Trump.

"I always said that (special counsel) Bob Mueller is not what should concern the President or the White House. That's the Southern District of New York," Christie, who led Trump's transition team, told CNN's Chris Cuomo Thursday night.

Christie, a former federal prosecutor, argued that the SDNY has no limit on the scope of their investigation, unlike Mueller's investigation.

He also told CNN that Trump's former personal attorney Michael Cohen and Trump's deputy campaign chairman Rick Gates , who pleaded guilty to two criminal charges in Mueller's investigation, could serve as "two tour guides that can take them through the Trump business and personal life."

Christie pointed to Cohen's testimony before the House Oversight Committee Wednesday in which Cohen said he was in "constant contact" with the SDNY "regarding ongoing investigations."

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