new today, a rising number of migrants seeking to enter the u.s., at least 40,000, have reached the u.s. border with mexico or are on a waiting list to seek asylum, and that's according to the "associated press." >> in the meantime, mexico is stepping up efforts to try to reduce the number of migrants from reaching the u.s. border. nbc's cal perry is in mexico city with an exclusive look at what that country is doing. good morning, cal. >> reporter: good morning, guys. we were able to take a trip down to the southern border between mexico and guatemala. look, we know that donald trump's policies have a massive effect in the u.s., but they have a ripple effect across the continent, not just the u.s. southern border, but mexico's southern border as well. in topachula, mexico, most people are from somewhere else and everybody has a story.