If the Trump administration reaches its goal of cutting 5% to 10% of staff, more than 100,000 people will leave the federal workforce, making it by far the largest layoff in U.S. history. The current record-holder is IBM, which cut 60,000 jobs in 1993.

More than 2 million federal employees across the country face an end-of day deadline to make a life-altering decision: resign or stay in their jobs.

The American Federation of Government Employees and two other unions claim the buyout offer is "arbitrary and capricious" and violates federal law, according to the complaint. The White House last week offered 2 million civilian full-time federal workers an opportunity to stop working this week and receive pay and benefits through Sept.