Why does the word "again" matter?

This is a repeat effort. Earlier budget requests from the administration also sought deep reductions to civilian research spending. In each previous round, Congress — which holds the constitutional power of the purse — largely restored or rejected many of the proposed cuts during the annual appropriations process.

That history offers a crucial caveat. A president's budget proposal is a request, not a law. It signals the administration's priorities and sets the opening position for months of negotiation with the House and Senate, which ultimately decide how much money each agency receives.

So while the proposal itself is significant, its final effect on researchers' grants, laboratory operations, and agency staffing will not be known until lawmakers complete the budget process.

What happens next?

The proposal now moves to Capitol Hill. Congressional committees will hold hearings, weigh the administration's request against their own priorities, and write the actual spending bills. Scientists, university administrators, and advocacy groups typically respond to such proposals with public campaigns arguing that federal investment in research drives economic growth, medical breakthroughs, and national competitiveness.

Previous rounds of proposed science cuts followed a similar path: dramatic headlines first, followed by a lengthy legislative fight, and a final outcome that often differed substantially from the White House's opening bid. Whether this cycle follows the same course remains to be seen.

How should readers weigh this?

Two cautions are warranted. First, the full scope of the cuts — specific agency budgets, percentages, and programme eliminations — requires reading Nature's detailed reporting, which documents the numbers behind the headline. Second, a proposal is preliminary by definition. Until Congress passes, and the president signs, actual appropriations bills, the numbers in this request represent an aspiration, not a commitment.

What is already clear is the direction of the administration's priorities: it wants to spend substantially less on federal science than current levels allow. For the US research community, which has been through this fight before, the coming months of budget negotiations will determine whether that ambition becomes reality.