Round one of Iran fight went to the US military. But ending things is much harder

On May 1, President Donald Trump sent letters to congressional leaders declaring that hostilities with Iran "have terminated." The statement was legally timed. The ceasefire imposed on April 7 has held — no exchange of fire between U.S. and Iranian forces since that date. Trump’s letter cited that record to sidestep the War Powers Resolution’s 60-day clock, which would have required congressional authorization or withdrawal of forces by May 1 — Day 62 of the conflict.

The legal argument is thin.