Charles Kupperman, the former deputy and acting national security advisor to President Trump, is seeking declaratory judgment from the U.S. District Court for the District of Columbia regarding whether he is immune from congressional testimony as a close advisor to the president, or whether he must testify in the ongoing impeachment inquiry. The House has subpoenaed Kupperman, but the executive argues that he is shielded by testimonial immunity. He now seeks a judgment from the court to resolve the constitutional dispute. The complaint is available here and below.