LOU DOBBS (HOST): Joining me now to talk about the president's legal authority to protect our southern border, Gregg Jarrett, Fox legal analyst and author of the New York Times best-seller The Russia Hoax. Good to see you. A stunning moment there, with a migrant who wanted back in to get a pardon from the President of United States for a felony three murder. 

GREGG JARRETT (GUEST): Yeah, this is the problem. I mean you're talking about thousands of thousands of people, we don't know who they are individually. Many may have criminal records, as this gentleman does. Some may be armed with weapons. We just don't know -- and because of the mass of people, we don't have the ability to properly detain and screen them for the alleged asylum claims. Now, to the journalists who scream oh it's a violation of the Posse Comitatus Act. The media is ignorant and obtuse. It is not a violation of the act.

DOBBS: Now let's be very specific. The national left wing media is -- what were the words? Obtuse and --

JARRETT: Ignorant and obtuse. They don't understand the law. The act envisions -- it prohibits the military from engaging in domestic law enforcement functions. That is not what this is. Look at the mass of people here. This is a threatened invading force that may well bash its way through our fence the way they did the Guatemalan fence. 

Previously:

Fox News guest claims migrant caravan is bringing “small pox and leprosy and TB that is going to infect our people”

Fox & Friends host: Migrant caravan could bring “diseases” to the United States

On Fox Business, Ann Coulter says the problem with the caravan “is who the people are who are coming”​