National Institute of Standards and Technology (NIST) employees reportedly face new policies limiting foreign researchers' tenures to three years, sparking concerns over talent retention and research disruption. A House Committee on Science, Space, and Technology letter from Rep.

Zoe Lofgren and April McClain Delaney alleges the Trump administration is implementing measures to curb non-U.S. scientists' roles, citing unverified rumors of lab access restrictions. NIST spokesperson Jennifer Huergo confirmed the agency is evaluating security protocols but declined details on implementation timelines or approval processes. The move risks exacerbating staffing shortages, as some foreign workers' recruitment plans were canceled due to uncertainty, per anonymous NIST sources. Congressional Democrats demand transparency by February 26 and a policy pause until federal oversight occurs, warning the changes could undermine U.S. scientific competitiveness. Critics argue the policies mirror broader anti-immigration trends, including recent restrictions on Chinese nationals at Department of Energy labs, despite bipartisan calls for balanced security measures.