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.

Unions representing many of the nation’s 2.3 million federal workers charge that the administration’s “unprecedented offer” violates the law.