Long ago Congress passed laws delegating a lot of rulemaking authority to the executive branch, the idea being that Congresspersons and their staff aren't deep-knowledge experts in most fields, and a lot of detailed rulemaking is best left to non-partisan career government employees (which, however, are usually guided by partisan political appointees, unfortunately). This is potentially dicey where the constitution is concerned: one of the foundational principles of the US constitution is separation of powers, and giving the executive branch what is essentially legislative power is maybe not in line with that.
But Congress did it anyway, and the SCOTUS has over the years upheld it. There was a landmark court case involving Chevron (the oil company). SCOTUS ruled there saying that the executive branch agencies responsible for rulemaking are experts in their fields, and we should mostly defer to them when their position seems reasonable, and when Congress hasn't passed a law that contradicts what they want to do.
Marbury is a much older case, that made precedent the idea that courts have the ability to strike down laws that they believe violate the constitution.
The current conservative-leaning SCOTUS is skeptical of what conservatives call the "administrative state" (basically: rulemaking done by the executive branch). They seem to not be a big fan of "Chevron deference", and are fully willing to exercise their Marbury-affirmed power to strike down executive actions that they don't believe are constitutional, or don't believe directly stem from laws Congress has passed.
But Congress did it anyway, and the SCOTUS has over the years upheld it. There was a landmark court case involving Chevron (the oil company). SCOTUS ruled there saying that the executive branch agencies responsible for rulemaking are experts in their fields, and we should mostly defer to them when their position seems reasonable, and when Congress hasn't passed a law that contradicts what they want to do.
Marbury is a much older case, that made precedent the idea that courts have the ability to strike down laws that they believe violate the constitution.
The current conservative-leaning SCOTUS is skeptical of what conservatives call the "administrative state" (basically: rulemaking done by the executive branch). They seem to not be a big fan of "Chevron deference", and are fully willing to exercise their Marbury-affirmed power to strike down executive actions that they don't believe are constitutional, or don't believe directly stem from laws Congress has passed.