A federal judge in Boston on Monday continued his pause of the Trump administration’s unprecedented plan to get millions of federal workers to resign “until I respond to the issues presented,” he said.

U.S. District Judge George A. O’Toole Jr. had temporarily halted the administration’s plan to offer mass buyouts to millions of federal workers on Thursday, just hours before a deadline to accept the offer. After a hearing on the issue Monday, he said the pause would continue until he ruled on the legality of Trump’s “deferred resignation” plan.

The unions, according to court filings, railed against the Office of Personnel Management’s “Fork Directive,” calling it an “unlawful ultimatum” and “sweeping and stunningly arbitrary action to solicit blanket resignations of federal workers.”

The Office of Personnel Management announced the mass “deferred resignation” program late last month. The program claims it will allow workers to resign now but get paid through September, though legal experts have questioned the validity of that agreement. Education Department staffers were warned last week that the administration could later decide to cancel the plan and leave the employers in the lurch.

A senior administration official said last week that 60,000 people had accepted the deal.

The initial deadline to accept the offer had been last Thursday night, but was extended by O’Toole after he scheduled the Monday hearing on the union’s request for a restraining order.

The union’s suit to stop the program alleged that the Trump administration does not have the legal authority to offer such buyouts.

The White House characterized the pause as a win last week.

“We are grateful to the Judge for extending the deadline so more federal workers who refuse to show up to the office can take the Administration up on this very generous, once-in-a-lifetime offer,” White House press secretary Karoline Leavitt said Thursday.