he Obama administration knowingly let in at least 16 admitted MS-13 gang members who arrived at the U.S. as illegal immigrant teenagers in 2014, a top senator said Wednesday, citing internal documents that showed the teens were shipped to juvenile homes throughout the country. Sen. Ron Johnson, chairman of the Senate Homeland Security Committee, said a whistleblower turned over Customs and Border Protection documents from 2014 detailing the 16 persons who were caught crossing the border. “CBP apprehended them, knew they were MS-13 gang members, and they processed and disbursed them into our communities,” Mr. Johnson, Wisconsin Republican, said. The...