Republicans on the House Oversight Committee are calling on their Democratic colleagues to provide more details about a series of trips taken to Mexico while staff were touring border detention facilities, amid reports that at least one Democrat has been involved in “coaching” migrants there on how to exploit U.S. immigration law. In a letter to Chairman Elijah Cummings, D-Md., obtained by Fox News, ranking member Jim Jordan, R-Ohio, said there were at least two committee staff trips into Mexico in August — one of which required Border Patrol agents to provide a special escort back into the U.S. “Although...