Defense attorneys for Roger Stone demanded a new trial Friday, one day after President Trump suggested that the forewoman in his friend’s case had “significant bias.” The legal motion could delay Stone’s Feb. 20 sentencing date on charges of witness tampering and lying to Congress.

The basis for the request and supporting records were filed under seal Friday, the filing’s existence was disclosed in a court order by U.S. District Judge Amy Berman Jackson that gave U.S. prosecutors until Tuesday to respond.

“Now it looks like the fore person in the jury, in the Roger Stone case, had significant bias,” Trump wrote on Twitter on Thursday, in a week in which his public comments have set off a crisis of confidence in the Justice Department. “Add that to everything else, and this is not looking good for the ‘Justice’ Department.”