“such an operation would be logistically impossible and politically untenable”
Why?
We have 3/4 of million LEOs in this nation.
We have untold numbers of people who would volunteer.
Threaten to use those options, and watch them stream out of the nation in rivers of people.
I've suggested on more than one occasion that the president invoke the 2nd Amendment and call out the militia. This would involve his asking military veterans to register with their local police or county sheriff. Younger vets just off the battlefields of the sandbox would support tactical functions, and older farts like myself would hold down desks to free up others for tactical work.
Foreign filth could use a taste of vigilante justice!