The Trump administration on Tuesday took a major step toward dismantling the U.S. Department of Education by firing roughly half of the agency’s workforce, a decision that teachers’ unions and other champions of public education said would have devastating consequences for the nation’s school system.

Trump adviser Elon Musk’s Department of Government Efficiency has cut dozens of contracts it dismissed as “woke” and wasteful. It gutted the Institute of Education Sciences, which gathers data on the nation’s academic progress, and the administration has fired or suspended scores of employees.