Watergate prosecutor Nick Ackerman on Wednesday compared President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE's "poor me" tweet to the end of Richard Nixon's presidency.

MSNBC host Chris Hayes asked Ackerman if he saw parallels between Trump's disposition and Nixon's isolation following the Watergate scandal that ended in his resignation.

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"[It's] very much the same," Ackerman said. "Nixon really kept to himself. He wound up sitting in front of the fire and just kind of ruminating."

The comments came in response to a tweet from Trump on Monday in which he wrote, “I am all alone (poor me) in the White House waiting for the Democrats to come back and make a deal on desperately needed Border Security."

I am all alone (poor me) in the White House waiting for the Democrats to come back and make a deal on desperately needed Border Security. At some point the Democrats not wanting to make a deal will cost our Country more money than the Border Wall we are all talking about. Crazy! — Donald J. Trump (@realDonaldTrump) December 24, 2018

Ackerman said Trump's behavior could reflect a fear of possible impending legal troubles. Special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE is reportedly working on the final report for his Russia investigation, which has lasted more than a year.

"He’s got three cooperating witnesses, three people who are very close to him,” Ackerman said. “Michael Flynn, his former security adviser, [Rick] Gates who was the deputy to [Paul] Manafort and was running the campaign after Manafort left, and then you’ve also got Michael Cohen, his personal lawyer,” he continued, referencing Trump associates who have been indicted or pleaded guilty in Mueller’s probe.

“I don’t think we ever had any witnesses in Watergate that were that close to Nixon,” Ackerman said. "I mean, John Dean — who was the lawyer in the White House — didn’t really have the closeness to Nixon that any of these three people have."