[rhaksw]

Congress cannot divest its legislative power, nor can it vest interpretive power to executive-branch agencies. The judiciary interprets law— not Congress.

[bastawhiz]

There's no issue with Congress interpreting laws here. The executive branch is (was). Which they have to do because how do you enforce a law that you do not have an interpretation of? If Congress disagrees with the judiciary's interpretation they can just pass a law that makes their interpretation the literal law.

[rhaksw]

The executive does not interpret law in the sense understood by the separation of powers. Interpretation is a judiciary power.