Sally Yates: Watch out for ghosts at Mar-a-Lago

Former Deputy Attorney General Sally YatesSally Caroline YatesA question of privilege: How Trump could still gut the Mueller report From border to Mueller, Barr faces challenges as attorney general Hillicon Valley: House Intel panel will release Russia interviews | T-Mobile, Sprint step up merger push | DHS cyber office hosting webinars on China | Nest warns customers to shore up password security MORE is defending the FBI in response to President TrumpDonald John TrumpWarren: 'White supremacists pose a threat to the United States like any other terrorist group' National Enquirer paid 0,000 for Bezos texts: report Santorum: Trump should 'send emails to a therapist' instead of tweeting 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.

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 ComeyJames Brien ComeyNadler 'encouraged' by response to Trump documents request Poll: Most Americans trust Mueller, Dems in Trump probes CNN's Amanda Carpenter: Trump attacking McCain 'to distract' from 'questions about the Russia investigation' 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 ClintonWilliam (Bill) Jefferson ClintonJohn Oliver blasts criticism of late night jokes: 'Go f--- yourself Jay Leno' Pelosi has won — and she's now the only one able to secure the border Monica Lewinsky explains why she never changed her name MORE. He was also involved in probes of Hillary ClintonHillary Diane Rodham ClintonOvernight Health Care: CDC pushes for expanding HIV testing, treatment | Dem group launches ads attacking Trump on Medicare, Medicaid cuts | Hospitals, insurers spar over surprise bills | O'Rourke under pressure from left on Medicare for all O'Rourke faces sharp backlash from left Dem strategist says South Carolina will be first 'real test' for O'Rourke 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.