“Iran is the world’s leading state sponsor of terrorism and Iran is at this time involved in multiple conflicts that undermine U.S. interest,” Tillerson said in the State Department’s Treaty Room.

In Syria, Iran supports President Bashar Assad‘s regime “even as it conducts atrocities against its own people, including the use of chemical weapons,” he said. Iran has also continued to support some Iraqi militant groups that have „been undermining security in Iraq for years, Tillerson added.