A rare crack in Republican unity is widening, as several senators defy Trump on Iran and he reacts with fury rather than confidence the war is over.

• Congress passed a war powers resolution to block more US fighting with Iran, with four Republicans breaking ranks.
• Trump exploded in a closed-door meeting, trading "sit down — no, you sit down" shouts with Senator Bill Cassidy.
• The administration pulled Cassidy in for a briefing, and he flipped his vote — but the original measure already passed and stands.
• Trump fears these votes for real reasons: in his first term a similar vote forced him to pull US support for the Saudi war in Yemen.
• More Republicans who lost seats or fear nothing — Cassidy, Cornyn, Massie — are starting to push back as his approval rating sinks.

Outlook: The resolution gives courts a tool if Trump restarts the war, but he is likely to claim any new strike is a fresh conflict and ignore it.