Former Deputy Attorney General Sally Yates Sally Caroline YatesButtigieg, former officials added to Biden's transition team The Hill's 12:30 Report: Delegates stage state-centric videos for the roll call Trump fires back at Yates for convention speech: 'Terrible AG' MORE is defending the FBI in response to 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 attacks on the law enforcement agency — and specifically Deputy Director Andrew McCabe.

Yates in a tweet on Sunday said the Secret Service should be on the look out for three ghosts at Mar-a-Lago given Trump’s tweet earlier in the day targeting McCabe.

This on Christmas Eve? Secret Service, be on the look out for three ghosts visiting Mar-a-Lago tonight. https://t.co/NidcQw1dCr — Sally Yates (@SallyQYates) December 24, 2017

The nod to "A Christmas Carol" was a relatively rare tweet for Yates, who has only 14 published tweets on her account.

Yates was appointed deputy attorney general by former President Obama and remained in the role in the beginning days of Trump’s administration.

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She was fired by Trump after she refused to implement his initial travel ban on a number of predominantly Muslim countries.

Trump in recent weeks has stepped up his attacks on the FBI, where he argues officials loyal to former FBI Director James Comey James Brien ComeySteele Dossier sub-source was subject of FBI counterintelligence probe Judge will not dismiss McCabe's case against DOJ Democrats fear Russia interference could spoil bid to retake Senate MORE, who Trump also fired, have exhibited bias.

Many of Trump’s attacks have focused on McCabe, who is also a target of Trump allies in Congress. McCabe faced 17 hours of testimony from two separate committees last week.

McCabe’s wife was a candidate for a Virginia Senate seat in 2015, and in the process, received hundreds of thousands in campaign donations from a political action committee with ties to Hillary and Bill Clinton William (Bill) Jefferson ClintonAnxious Democrats amp up pressure for vote on COVID-19 aid Barr's Russia investigator has put some focus on Clinton Foundation: report Epstein podcast host says he affiliated with elites from 'both sides of the aisle' MORE. He was also involved in probes of Hillary Clinton Hillary Diane Rodham ClintonFox News poll: Biden ahead of Trump in Nevada, Pennsylvania and Ohio Trump, Biden court Black business owners in final election sprint The power of incumbency: How Trump is using the Oval Office to win reelection MORE, including the investigation of her use of a private email server as secretary of State.

Reports circulated over the weekend that McCabe may retire soon, which Trump seized upon.