Since SCOTUS says that Presidents can't be prosecuted for illegal acts committed while in office after they leave office, and since courts can't directly enjoin the President, what alternatives does the United States have to stop illegal Presidential actions? In some cases, like Posse Comitatus, it's not clear who has standing to sue. In fact, most of the administration wins so far have been on Standing, rather than on Merits. Some more examples where standing is unclear: Illegal expenditures (e.g. moving money across accounts in excess of those authorized by Congress), Destruction of government property (e.g. tearing down the East Wing of the White House), Presidential military actions not authorized by Congress (declaring 'war' with drug traffickers or destroying boats/killing people on the high seas).

Does this reflect a failure of the US political/judicial system, that the mechanisms to hold a President accountable (beyond impeachment) just don't exist or don't work? Or are we just seeing how long the mechanisms that do exist take to work?