US Senate
Upper chamber of US Congress; 100 senators hold treaty, appointment, and war powers.
Last refreshed: 30 March 2026
Will the Senate ever reclaim the power to halt a presidential war?
Latest on US Senate
- 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.Source: US Constitution, Article I
- How did the US Senate vote on the Iran War Powers Resolution?
- On 26 March 2026, the Senate voted 47-53 to reject the Kaine-Paul War Powers Resolution, which would have required the president to end unauthorised military operations against Iran. Democrat John Fetterman voted against it; Republican Rand Paul was the sole senator to cross party lines in favour.Source: US Senate roll call
- What power does the US Senate have to stop a war?
- The Senate can pass a War Powers Resolution requiring the president to withdraw forces, but this requires a majority vote and can be vetoed. The Senate has not formally declared war since 1942. The 47-53 defeat of the Kaine-Paul resolution in March 2026 illustrated how rarely Congress invokes this power.Source: War Powers Resolution (1973)
- What is the difference between the US Senate and the House of Representatives?
- The Senate has 100 members (two per state) serving six-year terms, and focuses on treaties, appointments, and impeachment trials. The House has 435 members apportioned by population, serving two-year terms, and originates all revenue bills. Both chambers must pass legislation for it to become law.Source: US Constitution, Article I
- Why did John Fetterman vote against the War Powers Resolution?
- Senator John Fetterman (D-PA) voted against the Kaine-Paul War Powers Resolution in March 2026, breaking from his party. He was the only Democrat to do so. No official explanation was recorded in Lowdown coverage at the time of the vote.Source: US Senate roll call
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.
In the Iran conflict, the Senate's constitutional role over war authorisation became a flashpoint. On 26 March 2026, senators voted 47-53 to reject the Kaine-Paul War Powers Resolution, which sought to force Donald Trump to end US military operations against Iran without explicit congressional approval. John Fetterman broke with Democrats to vote against; Rand Paul was the sole Republican in favour.
The vote exposed a durable tension at the heart of American governance: Congress retains the formal power to declare war, yet modern presidents have repeatedly committed forces without it. The Senate's failure to muster even a simple majority underscores how seldom either party enforces legislative war powers against a president of their own choosing.
