U.S. District Judge Angel Kelley said the president’s proposed changes present an “immediate, devastating and irreparable” risk of harm.

The new National Institutes of Health policy would strip research groups of hundreds of millions of dollars to cover so-called indirect expenses of studying Alzheimer’s, cancer, heart disease and a host of other illnesses — anything from clinical trials of new treatments to basic lab research that is the foundation for discoveries.

The NIH, the main funder of biomedical research, awarded more than 60,000 grants last year totaling about $35 billion. The total is divided into "direct" costs – covering researchers’ salaries and laboratory supplies – and “indirect” costs, the administrative and facility costs needed to support that work.