And from
Clinton vs The City of New York - and where the court has defined what must happen for a law to become a law...
The Balanced Budget Act of 1997 is a 500-page document that became “Public Law 105—33” after three procedural steps were taken: (1) a bill containing its exact text was approved by a majority of the Members of the House of Representatives; (2) the Senate approved precisely the same text; and (3) that text was signed into law by the President. The Constitution explicitly requires that each of those three steps be taken before a bill may “become a law.”
The case dealt with what steps must happen in congress for a law to be considered 'passed' and end up on the president's desk for his signature. It will be one of the cases used if this goes to the supreme court.