What is the US Senate?: The US Senate is the upper chamber of Congress with 100 members (two per state) serving six-year terms. It has exclusive powers over ratifying treaties, confirming presidential nominations, and trying impeachments.
How many times has the Senate voted on the Iran War Powers Resolution?: Eight times between March and May 2026, including seven floor/committee votes and one discharge motion. The votes were 47-53, 47-52, 51-46, 47-52, 47-52, 47-50, 49-50, and finally 50-47 (discharge, 19 May) — the only one that succeeded.Source: event
What is the SAVE Act and what happened to it in the Senate?: The SAVE Act (H.R. 22) requires documentary proof of US citizenship to register to vote. A motion to attach it to the reconciliation package failed 48-50 on 27 April, closing the fast-track legislative route.
Which Senate seats are most at risk in the 2026 midterms?: Cook Political Report shifted four ratings toward Democrats on 13 April 2026, moving Georgia and North Carolina from Likely Republican to Lean Republican. The overall Senate map is under pressure from the Iran conflict's political dynamics and sustained Republican defections on war-powers votes.
What power does the Senate have to stop a war?: The Senate can pass a War Powers Resolution requiring the president to withdraw forces within 60 days, or refuse to authorise continued combat. It requires a simple majority and can be vetoed. The Senate has not formally declared war since 1942; the 19 May 2026 discharge motion is the first time a WPR on Iran has cleared committee in eight attempts.
How many judges has Trump had confirmed by the Senate in 2026?: The Senate confirmed John Thomas Shepherd to the Western District of Arkansas on 14 April 2026 and Justin D. Smith to the 8th Circuit by unanimous consent on 20 April 2026, continuing a steady pace of Article III confirmations across the first months of the Trump administration.Source: US Senate
What happened in the 19 May 2026 Senate discharge vote on Iran?: A Senate Foreign Relations Committee discharge motion cleared 50-47 on 19 May 2026, placing the Kaine war-powers resolution on the floor calendar. Four Republicans crossed party lines including Rand Paul, Susan Collins, Lisa Murkowski, and Bill Cassidy. It was the first successful procedural advance after seven defeats and sends the resolution to a floor vote before the 1 June WPR wind-down deadline.Source: event

Background

The US Senate is the upper chamber of US Congress, comprising 100 senators (two per state) serving six-year terms. Established under Article I of the Constitution in 1789, it holds exclusive authority over ratifying treaties, confirming presidential appointments, and trying impeachments. Its supermajority thresholds and filibuster rules give the minority party significant blocking power. War authorisation is shared with the House under the 1973 War Powers Resolution (WPR), which requires a simple majority to demand the executive withdraw forces within 60 days.

The Iran conflict made the Senate the most-covered legislative body in Lowdown's 2026 output. On 26 March, senators voted 47-53 to reject the first Kaine-Paul WPR; the votes repeated on 15 April (47-52), 22 April (51-46, tightest then), and twice more in early May. The seventh vote on 13 May fell 49-50 with three Republicans crossing (Paul, Collins, Murkowski). On 19 May 2026, a Senate Foreign Relations Committee discharge motion cleared 50-47 — the conflict's first successful procedural advance after seven defeats, placing the Kaine resolution on the floor calendar before the 1 June WPR wind-down deadline. On the Cuba track, the Senate voted 51-47 on 29 April to block a Cuba war-powers resolution via a Scott point-of-order; on the AI track, the Economy of the Future Commission Act (S.3339) passed committee with bipartisan support in May 2026.

The Senate is also a primary battleground for the 2026 midterms. Cook Political Report shifted four Senate race ratings toward Democrats on 13 April 2026, moving Georgia and North Carolina from Likely Republican to Lean Republican. The SAVE Act's reconciliation route was killed 48-50 on 27 April. Trump's confirmed judiciary count has risen with the Article III confirmations of Shepherd (Western District of Arkansas, 14 April) and Smith (8th Circuit, 20 April). Five successful procedural defeats on Iran and the unprecedented 19 May discharge together illustrate how rarely Congress enforces legislative war powers and how structurally resistant the Senate is to constraining a president of the majority party's choosing.