> This was just a test, and it was successful

It's too soon to say it's "successful": SCOTUS was 9-0 against and that was still only a few days ago, so far from being a success it's now turning into a constitutional crisis... assuming the administration doesn't fold, or flip-flop, or some combination of the two - which we've already seen plenty of[1].

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[1] the seemingly arbitrary and capricious tariff changes announced almost every day ever since the-day-after-April-fools-day.

So, he’s being brought back then?

Roll a D20: if it's even he comes back, if it's less than 10 he mysteriously disappears.

I wouldn't even put the odds of him coming back at 50%

20: He gets brought back in good condition, 19-16: He is gonna get brought back in terrible condition, 15-11 he doesn't come back, 10-1 he is dead

Note that I said "even" and "less than ten". Even ignoring damage he's already suffered in the prison, the "good outcomes" are still only 30% (10, 12, 14, 16, 18, 20).

If you read the SCOTUS ruling, all it upholds from the lower courts decision is that the USG must 'facilitate', not 'effectuate' his release. AFAIK the Court doesn't have a way to order El Salvador to do so