(Bloomberg) -- President Donald Trump will sign executive orders restricting the unions that represent many of the U.S. government’s 2.1 million employees, the White House said Friday.

One of the orders will limit the amount of official time federal employees can use to work on their union duties to no more than 25 percent, according to three senior administration officials. It will also require the federal government to start charging union’s rent for their office space, and stop paying employees for the cost of lobbying the federal government.

The American Federation of Government Employees, the nation’s largest federal employee union, endorsed Democrat Hillary Clinton for president in December 2015.

“This is more than union busting – it’s democracy busting,” AFGE National President J. David Cox Sr. said. “These executive orders are a direct assault on the legal rights and protections that Congress has specifically guaranteed to the 2 million public-sector employees across the country who work for the federal government.”

Another order instructs the Office of Personnel Management to update regulations to shrink the length of performance improvement periods, during which a problem worker cannot be fired, to 30 days across all agencies, said the officials, who briefed reporters on condition of anonymity. Such periods, which allow workers an opportunity to improve their performance and keep their jobs, currently last from 60 to 120 days, one of the officials said.

“These executive orders will make it easier for agencies to remove poor performing employees, and ensure that taxpayer dollars are more efficiently used,” White House Domestic Policy Council Director Andrew Bremberg told reporters on a conference call.

--With assistance from Josh Eidelson.

To contact the reporter on this story: Toluse Olorunnipa in Washington at tolorunnipa@bloomberg.net

To contact the editors responsible for this story: Alex Wayne at awayne3@bloomberg.net, Mike Dorning

©2018 Bloomberg L.P.