Time for Congress to start aggressively using its express constitutional power (under the Exceptions and Regulations Clause of Article III) to circumscribe federal courts' power to set aside congressional directives such as the ones that led to Chevron deference. "Separation of powers" is nowhere to be found in the Constitution; it's a bootstrapped creature of power-seeking judges.
Article I, Section 1 says: “All legislative Powers herein granted shall be vested in a Congress of the United States, which shall consist of a Senate and House of Representatives.”
Article II, Section 1 says: “The executive Power shall be vested in a President of the United States of America.”
Article III, Section 1 says: “The judicial Power of the United States, shall be vested in one supreme Court, and in such inferior Courts as the Congress may from time to time ordain and establish.”
Three specifically named powers, which are specifically assigned to three separate bodies, at the beginning of three separate sections. Gee, I wonder what the framers could possibly have been going with all this? I wish they had written papers elaborating on this concept that’s clearly reflected in the text: https://press-pubs.uchicago.edu/founders/documents/v1ch10s14...
It’s hard to imagine anything that is more part of the constitution than separation of powers. If you handed the constitution and a copy of the federalist papers to an alien who knew nothing else about our society, they would understand that the constitution requires separation of powers.