In a rational world, it would be the beggining of the end of Iran, as the next step we would be sending in the B-52's with Slim Pickin's at the controls. Instant parking lot.
In the new metrosexual US, Congress would demand we pull out and then try to cut the funds. And many people would support them.
By the time they got that done, the Iranian Navy and Air Force would no longer be with us. Possibly not even their ballistic missiles and SAMs. But given a week or three, those wouldn't amount to much either. The Navy is already paid for.
If they want to cut off funds already appropriated, it's Constitutional Crisis, impeachment and maybe Claire's time.