The chair of the Texas House Democratic caucus remained defiant Thursday in the face of one US senator’s bid to enlist the FBI’s help in returning him and his state House colleagues to the state.

Texas Republican U.S. Sen. John Cornyn said Thursday the FBI has granted his request to assist Texas law enforcement in locating House Democrats who fled the state, setting up a potential confrontation with Illinois Democratic officials who have vowed to protect them.

The Republican senator, who is facing a tough primary challenge, previously asked FBI Director Kash Patel for the agency’s help in tracking down the House lawmakers.