Switzer Memorial Building in Washington on Tuesday.Credit...Roberto Schmidt/Agence France-Presse — Health job cuts: The Trump administration laid off thousands of federal health workers, dismissing senior leaders and top scientists in a purge that outside experts and former officials said would cause an immeasurable loss of expertise.

The Trump administration fired staff at the Centers for Disease Control and Prevention and at the Food and Drug Administration on Tuesday, as it embarked on its plan to cut 10,000 jobs at the Department of Health and Human Services,

The Trump administration began mass layoffs of 10,000 staffers at U.S. health agencies on Tuesday, according to multiple sources familiar with the situation, with security guards barring entry to some employees just hours after they received dismissal notices.