HIDALGO — U.S. Sen. John Cornyn on Friday backed off his support of Congress taking up birthright citizenship after earlier joining prominent Republicans who have called for a review of the 14th Amendment. "It is going after a symptom rather than the cause of the problem in the first place," Cornyn said. Cornyn, the head of the GOP Senate campaign committee, softened his stance while visiting a port of entry along the U.S.-Mexico border. He met with the Texas Border Coalition, a group of local mayors and business leaders focused on border security and traffic backlogs at ports that affect...