'Barr must be impeached — if he doesn’t resign first’: Harvard Law professor says there are only two options for Trump’s AG

Constitutional law expert Laurence Tribe says it is a "new ballgame" for Congressional oversight after the bombshell report that special counsel Robert Mueller wrote a letter to Attorney General Bill Barr complaining about the public summary of his investigation.

“The summary letter the Department sent to Congress and released to the public late in the afternoon of March 24 did not fully capture the context, nature, and substance of this office’s work and conclusions,” Mueller told Barr. “There is now public confusion about critical aspects of the results of our investigation. This threatens to undermine a central purpose for which the Department appointed the Special Counsel: to assure full public confidence in the outcome of the investigations.”

Tribe, who has taught at Harvard Law for half a century and argued three-dozen cases before the Supreme Court, offered his analysis on Twitter.

"Mueller says AG Barr misrepresented the 'context, nature & substance' of his probe. What else is there? Barr is a total disgrace and a phony," Tribe wrote.

He had advice for Barr.

"He must now testify under Rep. Jerry Nadler’s rules, then resign," Tribe said.

"Mueller must now testify as well. This is a new ballgame," he argued.

"AG Barr flat-out lied to the American people about the Mueller report’s incrimination of President Trump. He’s been outed as a total fraud," he continued. "We can’t let Barr — or Trump — get away with such gross abuse of power."

"Barr must be impeached if he doesn’t resign first," Tribe added.