I think he can find a fine historical precedent. When a country in the 20th century did not want to have unwanted minorities around, they shipped them elsewhere by boxcar.
That has to be economical. Just round ’em all up, load them in a single long train, destination San Francisco train station in Pelositown:
Everybody out – and good luck to all!
This would have the additional … er … benefit that illegal immigrants would find life in San Francisco delightful, and would write to the people back home telling them to join the fun!
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Don’t tell Stephen Miller about this. He will not realize my suggestions are ironic. After he read Jonathan Swift, he Googled recipes to cook Catholic babies.
Shipping them on mass transit? That’s like a middle finger twofer