The two-week ceasefire the United States agreed to with Iran on Tuesday not only sets a deadline to seal a deal with Tehran, but leaves just days before the 60-day legal limit under the War Powers Resolution for waging war without congressional authorisation expires.This has left open the question of how the conflict proceeds if diplomacy fails and the legal clock runs out.“Almost all the various points of past contention have been agreed to between the United States and Iran, but a two-week...