reporter: as mexican business leaders urge amlo to support the agreement, he has pledged, like trump, to make sure it s a good deal for his country. protecting mexico s interest always. so we could see a big change for the u.s. southern neighbor. we re just a matter of hours away from the polls closing in mexico city. around midnight tonight local time, we expect to get the first preliminary indications from officials on who has the majority of the votes. leyla santiago in mexico city for us, thank you. the mexican election is just one of many internet issues the president will be dealing with this week, which brings us to your weekend presidential brief. a segment we bring you every sunday night, highlighting some of the most pressing national security information the president will need when he wakes up tomorrow. joining us now is cnn national security analyst and former national security counsel adviser sam win oh grad. she spend two years in the obama