On Wednesday, two prosecutors leading the Southern District of New York’s criminal tax fraud suddenly resigned.

The Daily Mail reports:

Attorneys Carey R. Dunne and Mark F. Pomerantz stepped down from the case after new Manhattan District Attorney Alvin Bragg expressed doubts over moving forward with a case against Trump, the New York Times reported.

Sources close to the investigation said it had ground to a month-long halt in the middle of prosecutors’ presentation of evidence to a grand jury.

Bragg’s team has also reportedly not questioned any witnesses for more than a month, after postponing a plan to grill at least one person absent the DA’s go-ahead.

The sudden resignation threatens to derail the years-long investigation, which was started by former District Attorney Cyrus Vance Jr. in 2018.

The SDNY’s investigation, which runs parallel to a tax fraud probe into the Trump Organization by New York Attorney General Letitia James, is looking at whether the former president’s family business misrepresented the value of its assets and allowed certain executives to scuttle taxes by compensating them with off-the-books perks.