PHOENIX, Arizona — Fresh off of his historic meeting with Mexican President Enrique Peña Nieto and his immigration policy speech here on Wednesday, GOP presidential nominee Donald Trump slammed Democratic nominee Hillary Clinton for running a negative, policy-free, campaign in an exclusive interview with Breitbart News. Just a few short weeks after the senior most level of Trump’s campaign underwent a major shakeup, the trajectory of the race has shifted with Trump’s poll numbers rising– and Clinton’s slipping. “I think we’ve had a great few weeks, and yesterday was certainly great,” Trump said when asked if his immigration speech and trip to Mexico represented an inflection point in the campaign. “Yesterday was certainly great with the president of Mexico and the speech in front of 15,000 people. You know there was 15,000 yesterday, you saw that?” Trump looked presidential and extracted two key concessions from the Mexican president: namely, that there’s a need to renegotiate the North American Free Trade Agreement (NAFTA) and that the United States has a right to build a wall. “I have great respect for the President of Mexico,” Trump told Breitbart News. “I thought he was a fantastic person and a fantastic representative for Mexico. And