Warren Hill spent more than two decades working at the Lake Clark National Park and Preserve, which spans 4 million acres of coastline, forests, lakes and glaciers in Alaska. Last summer, he was promoted to serve as maintenance supervisor,

Unions for federal workers have filed a lawsuit to block the mass firings of probationary federal employees by President Donald Trump's administration, alleging that officials are exploiting and misusing the probationary period to eliminate staff across government agencies.

The Pentagon said on Friday it would start firing about 5,400 civilian employees who were on probation, the first moves by President Donald Trump's administration at the department to make good on its promise to reduce the federal workforce.

The first firings of Defense Department civilian probationary employees are expected to start next week, with about 5,400 set to be released as the Pentagon anticipates reducing its civilian workforce by 5-8%.

NTEU is suing the Trump administration over its mass firing of federal employees, as well as its "pressure campaign on federal workers to quit their jobs."