A change of the Constitution is debated in Congress, 2 Thirds of the States must ratify it before it becomes an Amendment, so it it is basically a State by State issue and not a Congressional decision
Actually every law is a refinement, or expansion of the basic laws of our government. The only STATIC rules of governance are the Constitution. The legislature, on a federal level CAN pass roe V. Wade, if they define it EXACTLY as it is defined now, and it will ALWAYS pass the tests of judicial prudence.
The commerce clause has been so horribly twisted, that until the court has overturned EVERY violation the federal government can legislate damn near anything.
Of course, there are rules I'm not aware of, but as I understand it, law is law, and as long as ONE law is allowed to stand in violation, all laws must be accepted, with exceptions, or automatic reviews.
CHRIST I'm all twisted, Lawyers SUCK!! and if you wanna talk a quagmire, I point to our whole legal system long before I point to any war, we WILL win a war, but the lawyers can produce more sand than we can grease.