We don't need to move them, there are vacant homes everywhere. Even in San francisco the residential vacancy rate is 6%. The unhoused in San francisco make up about 1% of the population, so assuming the unhoused population takes up the same amount of housing per person as the housed population, we could house every unhoused person here and still have 5% left over.
That's the worst case too, the rest of the country has a higher vacancy rate and a proportionally lower unhoused population.
He already ignored a court order when he "deported" some Venezuelans to this ~~gulag~~ mega-prison. Whose to say he won't do the same next time around?