>> manu raju reporting live from philadelphia. i want to take you to mexico city. donald trump tweeted out this morning that maybe mexico's president shouldn't meet with the president of the united states if mexico won't agree to that i pour that wall. leyla santiago, has that tweet made its way to the office of the president in mexico? >> reporter: it's absolutely made its way to the president's office. i checked with them minutes after the tweet went out, they're very much aware of that. now it's very much a wait and see, let's see how he responds. let's go over the sequence of events, what led up to this. a few days ago, the mexican senators called on the president, enrique pena nieto, put out a three-minute video saying, we don't believe in walls, we're not paying for the wall, but we believe in