It writes the spending bills that set NASA budgets into law. The President requests a figure; the committee can accept, raise, or cut it. It has rejected identical White House NASA cuts before, funding the agency at $24.4 billion last cycle.Source: background

What is Congress's position on the FY2027 NASA budget?

Broadly resistant. The Senate Appropriations chair expressed bipartisan concern. Congress rejected an identical $18.8 billion request the prior year and passed $24.4 billion instead.Source: background

What is the difference between authorisation and appropriation for NASA?

The House Science Committee authorises programmes (sets policy and direction). The Appropriations Committee funds them. NASA can be authorised for a programme but receive no money if appropriations fail.Source: background

Background

The Senate Appropriations Committee is the body that translates White House budget requests into binding federal spending law. For NASA, it is the single most consequential legislative body: no matter what the House Science Committee authorises or the President requests, the final dollar figure depends on the Appropriations Committee's markup. When the FY2027 proposal to cut NASA to $18.8 billion emerged, the committee's chair, SEN. Susan Collins, expressed bipartisan concern, signalling resistance.

The committee has 30 members split between twelve subcommittees, one of which covers Commerce, Justice and Science, giving it direct authority over NASA's appropriation. It writes the spending bills that fund the government, and in recent years it has consistently rejected White House NASA cuts: Congress funded NASA at $24.4 billion in the previous cycle against an identical $18.8 billion request.

The FY2027 fight is particularly acute because Artemis is entering a critical capital phase, with the Lunar Gateway, advanced spacesuits, and Artemis III surface hardware all requiring sustained multi-year investment. A cut to $18.8 billion would force programme delays or cancellations at the precise moment Artemis II is demonstrating crewed deep-space capability.

On 12 May 2026, the Senate Appropriations Committee became the venue for the war's most significant constitutional moment. Appearing on $29 billion of Iran war spending, Defence Secretary Pete Hegseth testified under oath that Donald Trump holds 'all the authorities he needs under Article 2' and that 'we don't need' an AUMF. Senator Lisa Murkowski asked the opening question; her threatened AUMF was rendered procedurally moot by Hegseth's answer .

The exchange exposed a structural distinction that has run beneath the Iran war since 28 February 2026: the Appropriations Committee controls spending on the conflict but has no authority to force a formal authorisation for it. That power belongs to the Senate Armed Services Committee (SASC) and the House Armed Services Committee (HASC), neither of which has produced a binding instrument. The Appropriations Committee can theoretically attach a rider blocking war funds, but doing so risks a veto and has not been tested. The reaction to Hegseth's testimony was described as intense bipartisan frustration (WaPo); the war has now consumed $29 billion under no signed presidential instrument, a streak of 75 consecutive days .