A longtime hairdresser for the New York attorney general has come under scrutiny as the Justice Department’s efforts to charge Ms. James on other fronts falter.
Ms. James, New York’s attorney general, had been seeking to block a Justice Department investigation into her office by challenging the legitimacy of the U.S. attorney, John A. Sarcone III.
The disqualification of John A. Sarcone III from the case is the second time in three months that a judge has found a U.S. attorney to have been illegitimately installed by the Trump administration.