Most of Trump's executive orders, and certainly the tariff one, are unconstitutional if the constitution is interpreted in any manner that wold pass muster at law school. Whether any of his actions will be held to be unconstitutional by SCOTUS is an entirely different matter. The basic principle of US law at the moment seems to be "Trump gets what he asks for" and one of his appointees will find the words to justify that even if it means citing the outlawing of Hereward the Wake as a precedent.

I might hope that they would realise just how dangerous granting the president the power arbitralily to declare States of Emergency is but after the immunity ruling I'm not inclined to optimism. We'll just have to hope no-one burns down the Reichstag.