Bernstein challenges Fox News: Use credibility with Republicans to ask questions about Trump’s fitness for office

Journalist Carl Bernstein challenged Fox News on Sunday to dispatch reporters to Republican lawmakers to ask questions about President TrumpDonald John TrumpSanders urges impeachment trial 'quickly' in the Senate US sending 20,000 troops to Europe for largest exercises since Cold War Barr criticizes FBI, says it's possible agents acted in 'bad faith' in Trump probe MORE's fitness to serve amid questions about the president's mental health. 

"Let them send twenty reporters to talk to every Republican senator, every Republican congressman and come back and tell us what these people are saying in private, on background," Bernstein told CNN's Brian Stelter on "Reliable Source," referring to questions on Trump's mental fitness. 

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"I come back to Fox time and again because this is a chance to show that they can be fair and balanced, that they are capable of being a real reporting organization," he said invoking the outlet's fair and balanced slogan. 

Questions surrounding Trump's mental health surfaced this week after author Michael Wolff claimed in his new book "Fire and Fury: Inside the Trump White House," aides are concerned about Trump's mental stability and believe that he is “incapable of functioning in his job.”

White House press secretary Sarah Huckabee Sanders pushed back on the assertion during an interview with "Fox and Friends" on Friday. 

“It's absolutely outrageous to make these types of accusations and it's simply untrue, and it’s sad that people are going and making these desperate attempts to attack the president,” she said. 

Trump himself blasted the claim, calling himself "a very stable genius" in a tweet on Saturday.