Washington (CNN) Director of White House Office of Trade and Manufacturing Policy Peter Navarro said Friday that he won't "confirm or deny" whether he "personally" raised investigating Joe Biden or his son during contacts with Chinese officials.

"Me, personally? Now, here's the thing, I will never talk about what happens inside the White House," Navarro said during a contentious exchange with CNN's Jim Sciutto, calling the interview an "interrogation."

Navarro added, "Okay? Not confirm or deny. Because that's the slippery slope."

CNN first reported on Thursday that during a phone call with China's Xi Jinping on June 18 , President Donald Trump raised Biden's political prospects as well as those of Massachusetts Sen. Elizabeth Warren, according to two people familiar with the discussion.

The White House record of that call was later stored in the highly secured electronic system used to house a now-infamous June 25 phone call with Ukraine's president. That call helped spark a whistleblower complaint which led House Democrats to open an impeachment inquiry into Trump.

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