That’s not what happended.

The Supreme Court refused to prosecute Trump (for a blatantly illegal act) and ruled that he was immune to prosecution for “official acts” which they refused to define.

Then they slow walked the case back to a lower court - deliberately - so the determination was not made until after the election.

Then in a state court, Trump was convicted, but the judge delared there was no penalty “because only a federal court could apply punishment”.

Then a couple of days later the DoJ dopped the case because “the president is immune from prosecution”.

The ruling says that any prisoners sent to El Salvador are still under US jurisdiction.

Go and read it this time.

As far as I can find out, there is no constitutional restriction on outsourcing the imprisonment of Americans in foreign countries. This is not deportation.

Australia was founded on the outsourcing of imprisonment of British prisoners, after the US war of Independence when US states refused to continue to take British prisoners.

Garcia was determined to be a refugee because he was a member of an El Salvadorian gang, so there is no likelihood he will be released in El Salvador.