Faso declined, however, to comment on President Donald Trump saying he's the victim of a "witch hunt" or about calls by some Democrats in Congress for Trump to be impeached.
President Trump said Thursday that Mueller's appointment to lead the investigation "hurts the country".
"There's been no collusion between certainly myself and my campaign, but I can always speak for myself, and the Russians".
The Trump White House initially said that the memo was the precipitating factor in Comey's dismissal as Federal Bureau of Investigation director.
"The only thing that will become public is evidence used in a courtroom", Zeidenberg said. "And numerous questions he declined to answer came down to his concern of whether he might interfere with the investigation by Robert Mueller".
"With all of the illegal acts that took place in the Clinton campaign & Obama Administration, there was never a special (counsel) appointed", Trump tweeted. Democrats were openly accusing Trump of trying to influence the FBI investigation into Russia's meddling for his vested interests.
US Senate Intelligence Chair Says 'No Evidence' Yet of Trump-Russia Collusion
In an interview with Fox News Friday, Trump declined to comment on whether he has listening devices in the White House. It's unclear what Trump meant when he tweeted about "tapes" on Friday morning.
He also told network anchors at the White House on Thursday that appointing a special counsel "hurts the country". Trump tweeted early Thursday.
"If your implication is that the White House wants this, I think that's wrong", said Senate judiciary chair Chuck Grassley Wednesday night.
Meanwhile, Republican Senator Lindsey Graham says this appears to be going in the way of a criminal investigation - which could limit the ability of Congress to look into this.
The President's adoption of the role of a victim has been a potent political weapon before and he has frequently used it to position himself against the Washington establishment, including the media which he uses as a foil in the absence of an easily identifiable political enemy, like Hillary Clinton.
Senate intelligence Chairman Richard Burr, a North Carolina Republican, noted that Senate investigators were still pursuing former national security adviser Michael Flynn, even though they do not yet know how Flynn will respond to their subpoena for documents.