Former White House adviser Steve Bannon has warned that U.S. troops could be on the ground in Iran as the White House mulls whether to dramatically escalate the war with Tehran, now in its fifth week. Thousands of Marines have just arrived in the Middle East, the U.S. military said this weekend, with more on the way, accompanied by elite U.S. Army paratroopers and ships carrying equipment for amphibious landings on Iranian shores. The deployment of extra forces, specializing in quickly