This ruling impacts tariffs imposed by way of the International Emergency Economic Powers Act, which includes the reciprocal tariffs announced on April 2’s so-called “Liberation Day.” Bloomberg Intelligence estimates that roughly $170 billion in tariff revenues have been generated through February 20 via these policies. However, this ruling has no bearing on section 232 tariffs, which have been used to justify levies on the likes of steel and aluminum.

Trump administration officials had indicated that they developed contingency plans to attempt to reinstate levies in the event of this outcome. CNN reported that Trump called this ruling a “disgrace” and said he had a backup plan for tariffs.

It looks like there are several ways to reinstate these tarrifs at the Executive level https://www.cato.org/blog/supreme-court-got-it-right-ieepa-d...

It'd be cool if the backup plan was to get Congressional approval, per the US Constitution

That's just bluster. The IEEPA nonsense was already the creative trickery deployed in defense of a novel and prima facia unconstitutional policy. If they had a better argument, they would have made it.

And we know in practice that Trump TACOs out rather than pick real fights with established powers. Markets don't like it when regulatory agencies go rogue vs. the rule of law. They'll just shift gears to something else.