Security expert warns "miscalculation could bring us to conflict" with Iran More American troops are on their way to the Middle East Tuesday, with tensions between the U.S. and Iran growing. The U.S. believes Iran is behind attacks on oil tankers in the Gulf of Oman. CBS News senior national security contributor and former deputy director and acting director of the CIA Michael Morell joins "CBS This Morning" to discuss why sending troops to the region is a "prudent step" and why it's been difficult for the U.S. to shore up support from its allies.