Carl Bernstein calls Trump 'the most authoritarian president'

Veteran journalist Carl BernsteinCarl BernsteinCarl Bernstein calls Trump 'the most authoritarian president' Bob Woodward considering second Trump book: report Watergate reporter says current White House ‘potentially more dangerous situation’ MORE on Sunday called President TrumpDonald John TrumpPapadopoulos on AG's new powers: 'Trump is now on the offense' Pelosi uses Trump to her advantage Mike Pence delivers West Point commencement address MORE "the most authoritarian president" in U.S. history and alleged an "ongoing cover-up" that hasn't faced enough congressional pushback.

"There has been no real bipartisan investigation of the most authoritarian president in our history, probably," Bernstein, whose work at The Washington Post helped uncover the Watergate scandal in the 1970s, said on CNN's "Reliable Sources."

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“Right now, it’s obvious to anyone that watches, anyone who looks at the facts, reads the Mueller report, the obstruction part particularly: We are in the midst of a continued cover-up by the president, aided and abetted by the attorney general of the United States,” he said.

The Justice Department declined to comment, and the White House did not immediately respond to a request for comment.

Special counsel Robert MuellerRobert (Bob) Swan MuellerThe Hill's 12:30 Report: Trump orders more troops to Mideast amid Iran tensions Trump: Democrats just want Mueller to testify for a 'do-over' Graham: Mueller investigation a 'political rectal exam' MORE did not make a determination in his 448-page report about whether Trump obstructed justice. But Mueller also said that the report "does not exonerate" the president.

Attorney General William BarrWilliam Pelham BarrPapadopoulos on AG's new powers: 'Trump is now on the offense' House Democrats must insist that Robert Mueller testifies publicly Why Mueller may be fighting a public hearing on Capitol Hill MORE’s four-page letter to Congress summarizing the Mueller report, sent weeks before it was made public, garnered swift backlash from congressional Democrats who said Barr acted in Trump's interest and helped him claim total exoneration. Barr has denied those accusations.

Bernstein said the evidence against Trump is “so overwhelming.”

"This is no exoneration about his conduct, in terms of Russia and Russian contacts," Bernstein said.

--Updated at 2:19 p.m.