Article IV Section 4
The United States shall guarantee to every State in this Union a Republican Form of Government, and shall protect each of them against Invasion; and on Application of the Legislature, or of the Executive (when the Legislature cannot be convened) against domestic Violence.
Interesting discussion and I agree with most comments. If I was President this is what I would do:
1) Let Mexico know that if they do not stop this invasion all Federal Tax Dollars that go their way would be halted. Since Congress
controls the purse strings, the Congress would have to authorize the President to do this.
2) By this time, I would have 50-100 infiltrators embedded in the migration invasion to report G2. Things like on the make-up of the
invasion, where they are being supplied from, etc.
2a) IMO, once the supply chain is determined, let Mexico know and have them cut it off.
2b) Make public who is behind the invasion (Follow the money) and a accurate make-up of the folks that make up the invasion.
3) Once the specific area that they will cross is established (Re-read #2) then prepare to setup a POW type camp. Once they approach
the border, heard them into the POW camp, process them, and send them back to where they came from. Let it be known if they are
caught crossing the border again, they will get 5-years in a federal prison.
3a) The folks that are processed that have a record even if it is just for previously crossing the border keep them locked up and
prosecute them using the current laws on the books.
3b) It would be great if Mexico let us use a piece of their country along the border to build the POW camp to process the invaders.
Although I have similar feeling's about taking the invaders out. I do think this would be an optic nightmare though.
Now lets talk Logistics. Just think of the logistics needed for 7,000+ people. Food, Sanitary, shelter, transportation, etc. Think the logistics needed for an Army division. The key to sopping these folks is to cut off their supply train.