Attorney General William Barr on Tuesday revealed new details about his direct involvement in the sentencing recommendation for longtime Trump ally Roger Stone, including that he was told career prosecutors in the case were threatening to resign if they could not file their original sentencing memo.

Barr, testifying before the House Judiciary Committee for the first time, faced a panel of skeptical Democrats who repeatedly pressed him over the Stone case, which featured a highly unusual intervention from Main Justice on the recommended length of his prison sentence. President Donald Trump earlier this month commuted Stone’s 40-month sentence days before he was due to surrender to federal authorities.