Several of the nation’s leading research universities are admitting fewer PhD students this fall, according to data compiled from more than 50 institutions. The reported decline is about 15% compared with the previous year and involves 55 universities that are members of the Association of American Universities (AAU). AAU says its member universities grant about half of the nation’s research doctorates. The data are collected through the AAU Data Exchange. University officials and research advocates link the admissions drop to unreliable changes in federal research funding. They cite proposed federal research cuts that Congress restores at times, creating uncertainty for budgeting and long-term commitments. Advocates also point to reductions in grants from major agencies such as the National Institutes of Health and the National Science Foundation. In addition, they mention a new federal tax on wealthy institutions’ endowments. The sources also describe past disruptions to research awards during the Trump administration, including grant terminations later restored after court rulings. The potential impact described across reports includes fewer doctoral students to teach and mentor undergraduates and a smaller pipeline of future researchers.