Are President Trump’s Tariff Orders Constitutional?

The fundamental problem with the President’s tariff orders is not that he interpreted the law too expansively. It is that the law may be unconstitutional.
How much power may Congress delegate to federal agencies?

[T]he search for a single “non-delegation” principle applicable to all congressional powers is a futile one. Instead, the scope of permissible delegation of any particular congressional power must be sought in the meaning of the words describing that power.