An official working on the impeachment inquiry told CBS News that Reeker received a subpoena to appear.
"In light of an attempt by the State Department to direct Ambassador Philip Reeker not to appear for his scheduled deposition, and efforts by the State Department to also limit any testimony that does occur, the House Intelligence Committee issued a subpoena to compel his testimony. As is required of him, Ambassador Reeker is now complying with the subpoena and answering questions," the official said.