The 60-day limit expired on Friday as lawmakers left Washington, while Trump told Congress hostilities had ended after an April 7 ceasefire.
Senate Republicans largely resisted intervention, though Lisa Murkowski said she may introduce a restrictive AUMF when the Senate returns; Democrats argue the continuing Strait of Hormuz blockade still amounts to war.
Without congressional authorisation, the administration now has 30 days to wind down operations or face possible legal challenges, although some Democrats doubt the Supreme Court would curb Trump's war-making powers.
Does a ceasefire legally pause a president's war powers clock, or is this a new constitutional challenge?
As 20,000 sailors are trapped in the Gulf, what is the international plan to resolve this growing humanitarian crisis?
With global oil prices soaring, how long can the world economy withstand a naval blockade of the Strait of Hormuz?