Fulton County District Attorney Fani Willis sent a strongly worded letter to House Judiciary Committee Chairman Jim Jordan, a Republican from Ohio, after he asked her to turn over all documents related to her prosecution of former President Donald Trump and 18 others on charges related to election interference.

In the nine-page letter, Willis accused Jordan of “offending constitutional principles” with his “attempt to interfere with and obstruct this office’s prosecution.” She also suggested that he buy a book on racketeering prosecution at the price offered for non-attorneys and said that she was voluntarily responding to his request, as “settled constitutional law clearly permits me to ignore your unjustified and illegal intrusion.”

Willis’ letter is the latest salvo in a growing feud between her office and Jordan. Jordan has been a vocal critic of Willis’ investigation, which is still in its early stages. He has accused her of being politically motivated and has called for her to recuse herself.

Willis has denied any wrongdoing and has said that she is committed to conducting a fair and impartial investigation. She has also said that she is not afraid of Jordan’s attacks.

The feud between Willis and Jordan is likely to continue as the investigation progresses. It is also likely to have a significant impact on the upcoming midterm elections, as both sides use the case to try to mobilize their supporters.