Supreme Court officials are escalating their search for the source of the leaked draft opinion that would overturn Roe v. Wade, taking steps to require law clerks to provide cell phone records and sign affidavits, three sources with knowledge of the efforts have told CNN.

Some clerks are apparently so alarmed over the moves, particularly the sudden requests for private cell data, that they have begun exploring whether to hire outside counsel…

Lawyers outside the court who have become aware of the new inquiries related to cell phone details warn of potential intrusiveness on clerks’ personal activities, irrespective of any disclosure to the news media, and say they may feel the need to obtain independent counsel.

“That’s what similarly situated individuals would do in virtually any other government investigation,” said one appellate lawyer with experience in investigations and knowledge of the new demands on law clerks. “It would be hypocritical for the Supreme Court to prevent its own employees from taking advantage of that fundamental legal protection.”