To Get the Legislative Intent

If a law has recently been enacted, most of its drafters and supporters should still be alive. If term is ambiguous, has anyone ever interviewed the living enacters as to the real intent of legislature, as opposed to divination and mind reading?

If this has never been done, is there any procedural or constitutional obstacle to such a tactic? Naturally, both sides should be allowed to do an interview and to present their results, before a tribunal.