Federal prosecutors have asked that the materials seized from former Trump lawyer Rudy Giuliani's apartment be reviewed by a court-appointed outside expert, per a letter made public Tuesday.

Why it matters: The Justice Department typically balks at outside review, but prosecutors cited the "unusually sensitive privilege issues" and the "overt and public nature" of the search warrant as motives for the external review.

The big picture: The expert, known as a special master, will oversee a review of the records and materials seized by the FBI last week, reports Politico.

• Giuliani objected to the search last week on the grounds of attorney-client privilege, per the Wall Street Journal.

What they're saying: “[U]nder exceptional circumstances, the appointment of a special master to review materials seized from an attorney may be appropriate,” the letter reads.

• “Those circumstances may exist where the search involves the files of a criminal defense attorney with cases adverse to the United States Attorney's Office."