Justice Department Pardon Attorney Ed Martin went after Sen. Thom Tillis (R-NC) on social media Thursday, telling the senator to “go to Hell” after Tillis publicly questioned whether Martin still works at the DOJ.

The dispute erupted after Tillis, who had previously opposed Martin’s advancement within the department, made a remark about Trump administration nominations, saying he would apply “Martin standards” to anyone nominated to succeed former Attorney General Pam Bondi.