heads. you can bet it will be a big political issue in the days and weeks ahead. up until this point, immigration has been really the largest issue in the republican primary. donald trump went down to the mexican border, and guess who went there today? jeb bush. in our polo sandoval went there, too. he faced some questions from reporters? >> that's right, john. there were plenty of politics at play here in south texas, with the last hour, jeb bush walked into the restaurant only about six miles from the u.s./mexican border. he almost immediately start to do bash his policy and started pitching his own. >> jeb bush using his visit to south texas to highlights the differences between his immigration plan and donald trump's. >> his proposal is unrealistic. it will cost hundreds of billions, it will violate people's civil liberties. >> reporter: last month he flew