Health secretary Robert F. Kennedy Jr. has offered no new details about how his massive restructuring of the nation’s health department will improve Americans’ health, a day after thousands of layoffs ricocheted through its agencies.

WASHINGTON (AP) — Secretary Robert F. Kennedy Jr. offered no new details Wednesday about his massive restructuring of the U.S. Department of Health and Human Services, the day after thousands of layoffs ricocheted through its agencies, hollowing out entire offices around the country in some cases.

Kennedy’s silence is prompting questions from Republican and Democratic lawmakers alike, with a bipartisan request for President Donald Trump’s health secretary to appear before a Senate committee next week to explain the cuts.

As many as 10,000 notices were sent to scientists, senior leaders, doctors, inspectors and others across the department in an effort to cut a quarter of its workforce. The agency itself has offered no specifics on which jobs have been eliminated, with the information instead coming largely from employees who have been dismissed.