Richard Nixon’s former lawyer is accusing President-elect Donald Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE of constantly lying to the American people.

John Dean, who served as White House Counsel to the former president and was directly involved in the Watergate scandal, says he’s troubled by Trump’s lack of knowledge and penchant for lies.

"It is deeply troubling when you realize that the president-elect generally does not know what he is talking about,” Dean tweeted.

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“And when he does he lies.”

It is deeply troubling when you realize that the president-elect generally does not know what he is talking about and when he does he lies. — John Dean (@JohnWDean) December 29, 2016

Dean is far from the only former adviser to a Republican president taking his criticism of Trump to Twitter.

"Lets be clear: U aren't an American patriot & don't respect Constitution if u believe Putin more than our President and intelligent services,” tweeted Matthew Dowd, chief strategist of George W. Bush’s 2004 presidential campaign.

Lets be clear: U aren't an American patriot & don't respect Constitution if u believe Putin more than our President and intelligent services — Matthew Dowd (@matthewjdowd) December 29, 2016

Several key Republican lawmakers applauded the new sanctions imposed on Russia by president Obama in response to Russian inference in the 2016 presidential election.

Some, including Sens. John McCain John Sidney McCainThe Memo: Trump's strengths complicate election picture Mark Kelly: Arizona Senate race winner should be sworn in 'promptly' Cindy McCain: Trump allegedly calling war dead 'losers' was 'pretty much' last straw before Biden endorsement MORE (Ariz.) and Lindsey Graham Lindsey Olin GrahamSenate GOP aims to confirm Trump court pick by Oct. 29: report The Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Senate GOP sees early Supreme Court vote as political booster shot MORE (S.C.), believe the punishment needs to be even stronger.

In response to the sanctions, Trump released a statement saying it was time to “move on to bigger and better things,” but also promised to meet with intelligence officials "to be updated on the facts of this situation."