Moreover, at a minimum, Rubio told us (lied) that we had to attack them because they were about to attack us. With conventional weapons, of course. Fairly sure that Trump has said essentially the same since it started. Nothing to do with nuclear.
Wrap up: For at least the next ~3 years, we can go (back) to war with Iran (at least) at any time simply by claiming that they're about to have a nuclear weapon. Additionally, we can go to war with ANY country in the world by simply claiming that we believe that they were about to attack us.
No proof or persuasion (of Congress or the American people) required in either case, of course.
Small government, rule of law, the constitution, no wars, no regime change, etc. You know.