These are the federal agencies Trump is targeting for layoffs

What they're saying: A spokesperson for the largest federal employee union, the American Federation of Government Employees, told Axios that the Trump administration is "illegally" firing thousands of workers who provide "critical services" to communities across the country.

• "In AFGE's 93 years of existence under several presidential administrations — including during Trump's first term — no president has ever decided to fire thousands of furloughed workers during a government shutdown," they said.
• The federation is also suing the administration on behalf of its over 800,000 members.
• The White House declined to comment on the layoffs, referring Axios to the Office of Management and Budget, which said the layoffs are underway and "substantial."

The administration provided details on its RIF plan in a court filing Friday evening.

Here's what we know about the currently affected agencies, and what public services they offer:

Health and Human Services Department

1,100 to 1,200 estimated employees will be laid off within HHS.

• "HHS employees across multiple divisions have received reduction-in-force notices as a direct consequence of the Democrat-led government shutdown," a spokesperson told Axios' Maya Goldman and Tina Reed.
• The layoffs come after a wave of scientists already voluntarily or involuntarily left the department earlier this year due to concerns about Secretary Robert F. Kennedy's leadership.

The department is tasked with overseeing Medicare and Medicaid, which together provide health care for nearly 40 percent of Americans, including children. The department also administers the Temporary Assistance for Needy Families (TANF) and Head Start programs. The HHS also includes the Centers for Disease Control and Prevention, which monitors for emerging health threats.

The Department of Homeland Security

DHS will lose approximately 176 employees in the lay-offs.

• "This is part of getting CISA back on mission," they said in an emailed statement.
• DHS did not answer Axios' questions on if the layoffs would affect Immigrations and Customs Enforcement, the agency in charge of carrying out the president's massive detainee and deportation programs.
• It also did not confirm if there would be any cuts to the Federal Emergency Management Agency (FEMA) which prepares for natural disasters and responds to emergencies.

The Treasury Department

1,446 employees will likely be dismissed at the Treasury Department.

The Treasury Department presides over a variety of agencies in charge of fiscal policy, including; the Internal Revenue Service, which collects taxes; the U.S. Mint, which issues coins as well as commemorative medals; and the Financial Crimes Enforcement Network.

The Education Department

Around 466 Education Department workers will be let go.

• The department would not detail which department offices would be affected.

By the numbers: Roughly 50% of the department's workforce was let go in March, turning the department tasked with administering financial aid and funding, equal access for marginalized student populations and providing oversight for education policy into a skeleton crew.

• The cuts come after the Supreme Court in July allowed Trump to move forward with his plan to dismantle the department.

The Environmental Protection Agency

Approximately 20 to 30 EPA employees will be dismissed at the EPA.

• "Using our jobs as political leverage is an unprecedented and illegal abuse of power," Justin Chen, President of AFGE Council 238 said in an emailed statement.

The EPA is charged with protecting air quality, preventing water pollution, and overseeing hazardous waste disposal.

The Department of Housing and Urban Development

HUD is reducing its staff by around 442 employees.

• "HUD is implementing a reduction in force to align our programs with the Administration's priorities and the appropriations available to the department."

The department provides housing assistance and operates several programs tasked with ensuring equal access to homeownership for veterans, impoverished families and historically marginalized communities.

Additional departments affected

Approximately 187 employees at the Energy Department will be released from their roles at the Energy Department.

Commerce is expected to lose an estimated 315 employees.

Go deeper: Trump officials say "substantial" federal worker layoffs have begun

Editor's note: This story has been updated with a HUD statement and additional layoff figures.

Axios' Julianna Bragg contributed reporting to this story.