By Rami Ayyub TURMUS AYYA, West Bank, July 11 (Reuters) - U.S. Democratic lawmaker Ro Khanna said he was detained by Israeli settlers armed with U.S.-made rifles during a West Bank visit this week that he cast as an unfiltered look at the human toll of Israeli occupation as he weighs a 2028 presidential run. Speaking with Reuters on Thursday in a Palestinian village, Khanna said his group's van was surrounded by settlers wielding M4 rifles a day earlier while touring a part of the southern West