Inside the new political screening that’s stalling NIH grants

The US National Institutes of Health has seen grant applications held up by extra layers of scrutiny. Credit: Mark Wilson/Newsmakers/Getty Hundreds of grant applications to the US National Institutes of Health (NIH) are being held up at any given time by unprecedented scrutiny after peer review. Some have been flagged by an algorithm for using terms, such as ‘gender’ and ‘climate change’, that have been deemed not to conform with the priorities of the administration of US President Donald Trump. These new layers of review have delayed delivery of funds to labs and research institutions — and have even resulted in the outright rejection of some applications that had been approved by outside and agency scientists. Before 2025, it was unheard of for grants that had received such approvals to be rejected, says one of six NIH officials who spoke to Nature on condition of anonymity. The extra scrutiny ramped up in early 2026 and is conducted by NIH leaders and officials at the NIH’s parent agency, the Department of Health and Human Services (HHS). The extra scrutiny has particularly affected researchers waiting for previously approved projects to be renewed. …