“By law, Clayton will be allowed to serve as interim U.S. attorney for 120 days. If the White House doesn’t nominate anyone else by the end of that interim period, the judges of the federal district court in Manhattan could vote to appoint him to remain in the job. He could then serve until the Senate confirmed a nominee — and if Trump wanted Clayton to remain in the job, the president could simply not nominate anyone else.”
https://www.politico.com/news/2025/04/18/trump-schumer-clayton-prosecutor-00299505