Three cases about EPA authority are getting heard at the appeals court in DC
https://apnews.com/article/epa-tailpipe-pollution-cars-climate-republicans-biden-fe6bdf52420f083194574d8e0eae6a0f
You have to scroll down a bit but a key issue is the SCOTUS ruling in 2022 about how Congress MUST provide specificity in laws when authorizing government departments too make or change regulations.

Yet another effort to reduce the US government overreach by these administrative departments.