Russell Vought, Office of Management and Budget director, listens as he addresses members of the media outside the West Wing at the White House in Washington on Sept. 29. (AP Photo/Evan Vucci)

WASHINGTON (AP) — The White House budget office said Friday that mass firings of federal workers have started, an attempt by President Donald Trump’s administration to exert more pressure on Democratic lawmakers as the government shutdown dragged into a 10th day.

Russ Vought, the director of the Office of Management and Budget, said on the social media site X that the “RIFs have begun,” referring to reduction-in-force plans aimed at reducing the size of the federal government.

A spokesperson for the budget office said the reductions are “substantial” but did not offer more details.

Employees at the departments of Education, Treasury, Homeland Security and Health and Human Services, as well as the Environmental Protection Agency, were set to receive the notices, according to spokespeople for the agencies and union representatives for federal workers.

The aggressive move by Trump’s budget office goes far beyond what usually happens in a government shutdown and escalates an already politically toxic dynamic between the White House and Congress. Talks to end the shutdown are almost nonexistent.

Typically, federal workers are furloughed but restored to their jobs once the shutdown ends, traditionally with back pay. Some 750,000 employees are expected to be furloughed during the shutdown, officials have said.

Some leading Republicans were highly critical of the administration’s actions.

“I strongly oppose OMB Director Russ Vought’s attempt to permanently lay off federal workers who have been furloughed due to a completely unnecessary government shutdown,” said Maine Sen. Susan Collins, the chair of the powerful Senate Appropriations Committee, who blamed the federal closure on Senate Minority Leader Chuck Schumer, D-N.Y.

Alaska Sen. Lisa Murkowski called the announcement “poorly timed” and “yet another example of this administration’s punitive actions toward the federal workforce.” She urged affected Alaskans to reach out to her office.

For his part, Schumer said the blame for the layoffs rested with Trump.

“Let’s be blunt: nobody’s forcing Trump and Vought to do this,” Schumer said. “They don’t have to do it; they want to. They’re callously choosing to hurt people — the workers who protect our country, inspect our food, respond when disasters strike. This is deliberate chaos.”

The White House had previewed its tactics shortly before the government shutdown began on Oct. 1, telling all federal agencies to submit their reduction-in-force plans to the budget office for its review.

It said reduction-in-force plans could apply to federal programs whose funding would lapse in a government shutdown, are otherwise not funded and are “not consistent with the President’s priorities.”

On Friday, the Education Department was among the agencies hit by new layoffs, a department spokesperson said. A labor union for the agency’s workers said the administration is laying off almost all employees below the director level at the Office of Elementary and Secondary Education, while fewer than 10 employees were being terminated at the agency’s Office of Communications and Outreach.

Notices of firings have also taken place at the Cybersecurity and Infrastructure Security Agency, which leads federal efforts to reduce risk to the nation’s cyber and physical infrastructure, according to the Department of Homeland Security, where CISA is housed. The agency has been a frequent Trump target over its work to counter misinformation about the 2020 presidential election and the COVID-19 pandemic, and DHS said the layoffs were “part of getting CISA back on mission.”

Federal health workers were also being fired, though a Department of Health and Human Services spokesman did not say how many or which agencies were being hit hardest. A spokesperson for the EPA, which also has unspecified number of layoffs, blamed the Democrats for the firings and said they can vote to reopen the government anytime.

An official for the American Federation of Government Employees, which represents federal workers and is suing the Trump administration over the firings, said in a legal filing Friday that the Treasury Department is set to issue layoff notices to 1,300 employees.

The AFGE asked a federal judge to halt the firings, calling the action an abuse of power designed to punish workers and pressure Congress.