More than 20 staffers at Elon Musk’s Department of Government Efficiency have resigned, after refusing to use their technical expertise to “dismantle critical public services.”

“We swore to serve the American people and uphold our oath to the Constitution across presidential administrations,” the workers wrote in a joint resignation letter on Tuesday, obtained by The Associated Press. “However, it has become clear that we can no longer honor those commitments.”

The staffers who resigned worked for what was once known as the United States Digital Service, an office established during Barack Obama’s administration. All had previously held senior roles at such tech companies as Google and Amazon, but had joined the government out of a sense of duty to public service, they said.