The judge in Donald Trump’s civil fraud trial is demanding more information after a key witness was reported to be in negotiations to plead guilty to perjury in connection with his testimony in the lawsuit.

In an email posted to the trial docket Tuesday, Judge Arthur Engoron asked lawyers in the case to provide him with a letter “detailing anything you know” about the situation involving Allen Weisselberg, the former longtime finance chief at Trump’s company, the Trump Organization.

“I do not want to ignore anything in a case of this magnitude,” Engoron wrote, suggesting he may disregard all of Weisselberg’s testimony if he were to admit to lying on the witness stand.