1) DJT Declares A National Emergency, Call Up The Military...
the real military, not NG.

2) Use Corps Of Engineers To Erect several open air holding facilities, complete with razor wire. Staff with USMC. Have busses at crossings to convey all who want to willingly cross to the pens. Sort migrants to pens based on country of origin. Provide Portalets, mre's, water and blankets.

3) Simultaneously, but within a day or so, send 75 NG C-130 transport planes (which can operate from mainly unimproved desert strips). Each can handle 100 or more passengers with ease. Load them on busses, give each a visa application, and deliver them to the planes. fly them back to their country of origin under military guard, accompanied by US fighter escort.

4) Deduct the cost of the entire operation proportionately from the 'foreign aid' normally given to each country.

It will be over quick, and will serve as a lesson to future mobs.

Too simple? Won't happen? Don't count on it....DJT is pretty well pissed, and all the above is perfectly legal under existing national law.