The top ethics lawyer in former President George W. Bush's administration said 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 is making special counsel Robert Mueller's job easier with his attacks on FBI officials.

"Using Twitter on Christmas Eve to intimidate a witness (McCabe) in a criminal investigation is not a very Christian way to celebrate the holiday," Richard Painter tweeted Sunday. "But it does make Mr. Mueller’s job easier and that’s a nice thing to do. Merry Christmas!"

Using Twitter on Christmas Eve to intimidate a witness (McCabe) in a criminal investigation is not a very Christian way to celebrate the holiday. But it does make Mr. Mueller’s job easier and that’s a nice thing to do. Merry Christmas! — Richard W. Painter (@RWPUSA) December 24, 2017

His tweet comes after Trump lashed out this weekend at top FBI officials in his latest stream of criticism of the nation's law enforcement agency.

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On Saturday, Trump swiped at multiple agency officials in a string of tweets, in which he suggested FBI Deputy Director Andrew McCabe may have been compromised by political donations and ripped former FBI Director James Comey as a leaker.

“FBI Deputy Director Andrew McCabe is racing the clock to retire with full benefits. 90 days to go?!!!” Trump tweeted Saturday.

Mueller is conducting an investigation into possible collusion between the Trump campaign and Russia. The investigation is wide-ranging and Trump's critics hope it will lead to obstruction of justice charges for the president.

Trump has called the Russia probe a witch hunt and has denied collusion between his campaign and Russia.

Trump and the White House have also repeatedly denied the president is considering firing Mueller, amid public speculation.