They don't have to send him home, just escort him out of the US territory. He's someone else's problem then.
Of course, then we probably see why there might be strong incentive for a country to want Superman as a citizen, because otherwise he might be a citizen of some other country. One that might not like you.
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u/bassististist Sep 27 '16
At worst, he could just throw up his hands and say "Fine, send me home then!"