At the very minimum, tax enough of the $800 billion to cover what they cost American taxpayers. That would be about 19%.
But that doesn’t account for how they’ve driven rents up, and property values down, in the working class neighborhoods they invade - both suburbs and cities. So let’s tax an additional 6% to recapture an additional $50 billion above what they cost us, and distribute it in those areas to lower-income citizens for subsidies, contingent upon their working at least part-time.
That brings it to 25%. That’s reasonable.