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John Dean, the former White House counsel to Richard Nixon, ripped into President Trump, saying he should have been impeached on day one of stepping into office.

"I think this president probably should have been impeached the day he walked in," Dean said Saturday on CNN. "He's incompetent. He has a terrible attitude. He doesn't understand government. He is in there trying to build his own brand, and he's taking advantage of the office from day one. It's just kind of caught up with him with this incident."

Dean claimed that Trump should also be facing "about 10 instances of obstruction of justice from the Mueller report," which the House Democrats' impeachment hearings have not discussed.

His comments come after House Democrats hold the first week of public impeachment hearings. The proceedings center on whether Trump withheld military aid from Ukraine in exchange for an investigation into Joe Biden and his son, Hunter Biden.

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In another CNN appearance earlier this week, Dean indicated that the impeachment witnesses who have publicly testified have more evidence against Trump than Congress had against former President Richard Nixon. House Speaker Nancy Pelosi echoed that sentiment on Thursday, saying, "What President Trump has done ... makes what Nixon did look almost small."

The president has clashed with Dean in the past calling him a "sleazebag" as the Watergate-era figure prepared to testify in front of the House this summer. Dean, 80, was part of the Watergate scandal as he cooperated against his co-conspirators in order to receive a shorter prison term.

He testified in front of Congress this summer to give "a little historical perspective on the Mueller report" and compared the report to the Watergate scandal, which took down Nixon.