Comment by veridies

That's a good question. I'm not a lawyer, but I think it would be problematic if Congress could make those decisions. That would allow them to de facto create ex post facto laws by contriving "interpretations" of past laws. It might incentivize intentionally ambiguous laws that allow them flexibility in the future. At that point, the Supreme Court would be in the very odd position of deciding whether something is a plausible interpretation of a previous law.