A closed sign is displayed at The National Archives entrance in Washington on Tuesday, as a partial government shutdown stretches into its third week. A high-stakes move to reopen the government will be the first big battle between Nancy Pelosi and President Donald Trump as Democrats come into control of the House. Credit: Jose Luis Magana | AP

A federal employees union filed a lawsuit Monday against the Trump administration, alleging the partial government shutdown is illegally forcing more than 400,000 federal employees to work without pay.

The partial shutdown began at midnight, Dec. 22.

Since then, many federal departments temporarily closed and delayed worker compensation indefinitely. Even so, employees deemed “essential” or “excepted” have been expected to come to work. The suit asked for the named plaintiffs and others with the same classification be paid owed wages.

“It’s outrageous the government expects them to work without knowing when they’ll get their next paycheck,” lead attorney Heidi Burakiewicz said in an interview with The Washington Post.

The governmental impasse stemmed from President Donald Trump’s demand for $5 billion toward a wall on the U.S.-Mexico border. Now on its 10th day, the stalemate does not appear to be budging.

Burakiewicz’s District of Columbia-based law firm, Kalijarvi, Chuzi, Newman & Fitch, and American Federation of Government Employees, the largest federal employee union, initiated Monday’s complaint as the shutdown entered its second week. It’s the first legal action targeting effects of the closure.

According to court documents, “essential” government employees are those “performing emergency work involving the safety of human life or the protection of property.” Often, Burakiewicz said, the roles are dangerous, yet necessary, to a well-functioning democracy.

“All the jobs that we think of as ‘traditional first responders’ are likely considered essential,” she said, listing Border Patrol agents, law enforcement officers and federal firefighters as examples.

The two named plaintiffs, Justin Tarovisky and Grayson Sharp, are corrections officers with the federal Bureau of Prisons. Both are also deemed essential.

“They’re working a dangerous job, they’re critically understaffed, and now, they don’t know when they’ll next get paid,” she said, adding that “essential” employees will continue incurring the costs of commuting to work, like gas and child care. Without knowing how long the shutdown will last, many workers may be forced to make challenging choices.

“They may be paycheck to paycheck, have cellphone bills, mortgages … It’s unacceptable for any employer, but especially for the U.S. government,” Burakiewicz contended.

Her firm sued the government during a 16-day shutdown in 2013 over the funding for President Barack Obama’s health care law, arguing that failure to pay federal workers on their regularly scheduled payday was a violation of the Fair Standards and Labor Act. The court agreed, holding that employees needed to know when they would receive their paycheck and ordered the government pay double the amount owed them. There are 25,000 employees still waiting to receive these damages.

Federal employees are paid biweekly. Because of the late-December shutdown timing, only employees with unpaid overtime wages, like Tarovisky and Sharp, can presently file suit. The next pay cycle ends at midnight on Jan. 5, with the scheduled payday soon thereafter. If the government closure is still ongoing, and no “essential” employee receives a salary, legal claims will become available to them all.

Of the 2.1 million federal workers nationwide, The Washington Post reported that approximated 800,000 are expected to be impacted by the shutdown.

There are 420,000 federal employees deemed “essential.” At least another 380,000 federal workers are deemed “nonessential,” according to CNBC, and have been placed on temporary leave until the shutdown ends. “Furloughed” employees span the departments of Commerce, Transportation, Housing and Urban Development, as well as the Forest and National Park Services and the IRS.

For them, because they are not performing government duties, they have no recourse for financial harm suffered.

Since Dec. 22, Trump has continued to defend his positions on the border wall and government shutdown, even claiming many federal workers encouraged him not to waver.

Tony Reardon, president of the National Treasury Employees Union, which represents 150,000 members at 33 federal agencies and departments, called the shutdown “a travesty.”

In a survey of 1,500 union members, The Washington Post previously reported that about 85 percent said they have limited holiday season spending or are planning to do so because of uncertainty about income. “Federal employees should not have to pay the personal price for all of this dysfunction,” Reardon said.

Like Reardon, Burakiewicz said the federal workforce shouldn’t be used as a pawn.

“It reflects a complete lack of understanding about who is harmed by this shutdown,” she said. “Federal workers overwhelmingly want it to end. The fact that we just field this lawsuit in conjunction with the largest union of federal workers supports that.”

In a statement Monday, David Cox, the union’s national president, wrote that requiring federal employees to work without pay is “nothing short of inhumane.”

“They deserve the decency of knowing when their next paycheck is coming and that they will be paid for their work,” he said. “Our intent is to force the government and the administration to make all federal employees whole.”

Washington Post writers Philip Rucker and Lenny Bernstein contributed to this report.