My understanding is that in 2024 that some power of congress to delegate to power to the executive was limited in "Loper Bright Enterprises v. Raimondo" over turning(partial I assume, I am not well versed in this) the opinion called "Chevron deference" from "Chevron U.S.A., Inc. v. Natural Resources Defense Council".
So the Supreme Court at least puts limits on what/how congressional powers can be delegated.
The justification given by this administration to act independently is legally absurd.