If you're looking for a detailed dive into why Jack Smith's appointment as Special Counsel by AG Merrick Garland was likely illegal, here's a good explainer:
Is Jack Smith An Illegitimate Prosecutor? Has Every Action Taken By Him Been Unlawful?
The Constitution Doesn't Allow The AG To Create Offices and Imbue Them With Powers Limited To "Officers" of the United States.shipwreckedcrew.substack.com
Seems like the SCOTUS agree.