As the prosecutor, Fani T. Willis, discussed the case at a conference, her office sought an emergency protective order to prevent more leaks of discovery materials.
The former president is facing down Michael Cohen, his longtime fixer, in a Manhattan courtroom, while other ex-loyalists are cooperating in a case against him in Georgia.
The guilty pleas present a host of challenges as state and federal prosecutors engage in parallel efforts to hold Donald J. Trump accountable, defense lawyers and former federal prosecutors say.