Republican presidential front-runner Donald Trump has shown a softer flip-side to his immigration policy leanings just one day after visiting the U.S.-Mexico border, saying Friday that America should use a ‘merit system’ to allow some illegal immigrants to stay. ‘I’m a believer in the merit system,’ Trump told MSNBC during a phone-in interview on the ‘Morning Joe’ program. ‘If somebody’s been outstanding, we try and work something out,’ he said, while stopping short of addressing whether that might include a path to U.S. citizenship. Trump also acknowledged that the enormous media boom his candidacy has generated could be fleeting, and downplayed the possibility that he might break with the GOP to run as a third-party candidate. ‘I’m just chugging along,’ he said. ‘You know, maybe people will get tired of me. Who knows? I mean, this press is crazy. … I don’t know, maybe people get burned out.’ 20 MINUTES WITH THE DONALD: Trump gaev a lengthy interview on Friday with MSNBC, saying he supports a ‘merit system’ to determine the status of more than 11 million immigrants living illegally in the US MORNING JOE: Joe Scarborough (left) asker Trump if anything could stop his political juggernaut, and the billionaire…