' Trump's saber-rattling about Iran has reached a dangerous new low with his threat to 'end' Iran! If Iran wants to fight, that will be the official end of Iran. Never threaten the United States again!' Trump tweeted. 'Since the president reneged on the Iran nuclear deal last year his policies have been geared towards provoking Iran into retaliation to give cover for a perilous escalation favored by administration hawks.' Trump's tweet came after Fox New said a rocket was fired into Baghdad's fortified Green Zone, about a mile away from the U.S. Embassy in Iraq. There is no evidence that Iran-backed forces were behind the attack. A 'similar incident' in Iraq last year 'led to Bolton asking the Pentagon for options to militarily strike Iran.'