Watergate-era figure John Dean on Friday challenged Supreme Court nominee Brett Kavanaugh’s veracity and his views on legal issues.

Dean (pictured above left), who served as White House counsel to Richard Nixon, pleaded guilty to obstruction of justice in 1973 and later testified against the president before Congress.

He has been a severe critic of President Donald Trump.

Testifying before the Senate Judiciary Committee on Friday, Dean echoed Democratic allegations repeated during this week’s confirmation hearing, including an old one that Kavanaugh during his 2006 confirmation hearing for a seat on the U.S. Court of Appeals for the District of Columbia lied about his role in crafting policies on interrogation of terrorism suspects.

It is an issue that Senate Minority Whip Richard Durbin (D-Ill.), who asked the question in 2006 that prompted Kavanaugh’s answer, has repeatedly hammered the nominee on this week.

Dean said records from Kavanaugh’s years as a lawyer in George W. Bush’s administration could have cleared up the discrepancy. Dean thus echoed Democrats’ demand throughout the three-day examination of Kavanaugh that they must have an estimated 1 million documents from the nominee’s White House tenure before they can adequately assess his qualifications and temperament.

“His answers to this committee have not resolved the issue,” Dean said. “Frankly, I’m surprised that Judge Kavanaugh is not demanding that every document that he’s ever handled be reviewed by this committee. Unless of course, there’s something to hide.”

Related: Dems’ Kavanaugh Resistance Waivers Before ABA Testimony

Republicans on the committee weren’t impressed with Dean’s repetition of allegations that had already been discussed at length during the hearing.

Sen. John Kennedy (R-La.), for example, sharply rebuked Dean and questioned his credibility.

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“You did the right thing, ultimately,” he said, referring to the Watergate testimony. “But you only did it when you were cornered like a rat. And it’s hard for me to take your testimony seriously.”

Regarding the current nomination, Dean compared Kavanaugh (pictured above right) to former Chief Justice William Rehnquist and Justice Clarence Thomas. He accused both men of lying during their confirmation hearings.

“It’s clear there was an across-the-board failure to fully vet the nominees, and it has haunted their careers on the court,” he said. “It’s hurt the court and the American people.”

He added: “Judge Kavanaugh may be traveling the same path as Rehnquist and Thomas.”

Thomas electrified the nation during his 1991 confirmation hearing after Democrats on the judiciary panel accused him of multiple sins, including sexually harassing a woman on his staff, Anita Hill.

Related: Here Are Dems’ Six Most Damaging Steps on Path to Confirmation Chaos

Thomas, who strenuously denied the Democrats’ allegations, responded at the end of the ordeal by describing it as “a high-tech lynching of an uppity black man.” He was ultimately confirmed and has been a fixture on the high court ever since.

Rehnquist’s allegedly dishonest testimony also has been disputed. Rehnquist came under allegations of false testimony related to his role in challenging the qualifications of voters in Phoenix from 1958 to 1968.

Several witnesses from Phoenix, however, supported Rehnquist’s version that he merely offered legal advice to Republican poll workers and challengers, and occasionally went to precincts to settle disputes. Those witnesses said Rehnquist never harassed voters.

Beyond issues of Kavanaugh’s honesty, Dean said the judge has dangerous views on the powers of the presidency.

“You did the right thing, ultimately. But you only did it when you were cornered like a rat. And it’s hard for me to take your testimony seriously.”

“If Judge Kavanaugh joins the court, it will be the most presidential powers-friendly court in the modern era,” he said. “Republicans and conservatives only a few years ago — I know well — fought the expansion of presidential power and executive power. That’s no longer true.”

Kavanaugh has said he views the United States v. Nixon in 1974, in which the high court ordered the president to turn over tape recordings made in the Oval Office, as one of the four greatest Supreme Court rulings. Notwithstanding that, Dean said he is not convinced that Kavanaugh believes the justices correctly decided that case.

“He would have the Congress immunize sitting presidents from both cvil and criminal liability,” he said. “Under Judge Kavanaugh’s recommendation, if a president shot somebody in cold blood on Fifth Avenue, that president could not be prosecuted while in office.”

Related: Kavanaugh Clarifies He Doesn’t Back Unlimited Presidential Powers

That simply misstates Kavanaugh’s position, however. He has never suggested that a president is immune from prosecution or lawsuits. In a 2009 University of Minnesota Law Review article, Kavanaugh wrote that it might be wise for those actions only to be deferred. He explicitly stated that a president could be prosecuted after leaving office.

Kavanaugh also has testified this week that he believes there are limits on a president’s powers.

Sen. Sheldon Whitehouse (D-R.I.) said he is concerned that Kavanaugh has made a subtle distinction between a president’s obligation under United States v. Nixon to comply with a trial court subpoena on the one hand, and a hypothetical grand jury subpoena on the other.

“He played a little game for us, to try to have the best of both worlds — to reserve a little escape hatch for himself to be able to shut down, for instance, [an independent counsel Robert] Mueller investigation or Southern District of New York investigation subpoenas, while still purporting to uphold United States v. Nixon as a big favorite decision of his,” the senator said.

Dean agreed with Whitehouse, as he did with other Democrats on the committee.

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