Trump should call a national emergency? For what? Illegal immigration is at its lowest point in 10 years.
And, drugs don't come across some faceless part of the border on the backs of illegals, they come via our regular ports of entry in trucks and cars, via paid drug mules, not some illegal immigrant they found in the caravan. Cartels like to know who they are dealing with, as well as who the mules family is, so that if the shipment doesn't make it, they can go after the person who did the transport. And, those immigrants won't know much about the USA, so how the hell would they know where to take the drugs?
Fentanyl doesn't come from Mexico, it's made in China, and comes here via planes and seaports.
As far as terrorists crossing the southern border? Out of the over 3,700 people they caught trying to enter the country who were on a suspected or terrorist watch list, only TWELVE of them crossed the southern border. The rest of them flew in on airplanes.
So, I ask again, what crisis is there on the southern border? Don't believe the hype, because Trump is conning you yet again.