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.

A letter sent to employees of the U.S. Agency for International Development on Friday said that most positions would be eliminated in the coming months through reductions in force. Some functions of the agency,