UNITED STATES

A federal judge in Washington has temporarily blocked enforcement of President Trump’s controversial ban on entry to the United States. Airlines have planned to begin to allow passengers from banned countries to board.

Following the ruling, government authorities immediately began communicating with airlines and taking steps that would allow travel by those previously barred from doing so.

At the same time, however, the White House said in a statement that the Justice Department would “at the earliest possible time” file for an emergency stay of the “outrageous” ruling from the judge. Minutes later, it issued a similar statement omitting the word “outrageous.”

“The president’s order is intended to protect the homeland and he has the constitutional authority and responsibility to protect the American people,” the White House said.

The federal judge’s ruling, which was broader than similar ones before it, set up a high-stakes legal confrontation between the new president and the judicial branch over his temporary ban on entry by citizens of seven majority-Muslim countries as well as refugees. In his opinion, U.S. District Judge James L. Robart wrote that “fundamental” to the court’s work was “a vigilant recognition that it is but one of three equal branches of our federal government.”

“The court concludes that the circumstances brought before it today are such that it must intervene to fulfill its constitutional role in our tripart government,” he wrote.

The ruling is temporary, and the ultimate question of whether Trump’s executive order will pass constitutional muster will fall to higher-level courts. Legal analysts have said the ban could be difficult to permanently undo because the president has broad authority to set immigration policy.

Robart granted a request from lawyers for the state of Washington who had asked him to stop the government from acting on critical sections of Trump’s order. Justice and State department officials had revealed earlier that about 60,000 — and possibly as many as 100,000 — visas already have been provisionally revoked as a result of Trump’s order. A U.S. official said that because of the court case, officials would examine the revoking of those visas so that people would be allowed to travel.

Washington Attorney General Bob Ferguson hailed the case as “the first of its kind” and declared that it “shuts down the executive order immediately.” Robart, a judge appointed by George W. Bush, said in his written order that U.S. officials should stop enforcing the key aspects of the ban: the halting of entry by refugees and citizens from certain countries. He did not specifically address the matter of those whose visas already had been revoked.

The Justice Department said in a statement that it was “reviewing the court’s order and will determine its next steps.” A State Department official said the agency was “working closely with the Department of Homeland Security and our legal teams to determine how this affects our operations.”

“We will announce any changes affecting travellers to the United States as soon as that information is available,” the official said.

Immigration lawyers have said that they are still assessing the Washington case but were heartened by it.

“The order makes it clear that all of the main provisions of the executive order cannot be enforced at this time,” said Lee Gelernt, deputy director of the American Civil Liberties Union’s Immigrants’ Rights Project. “That means that a lot will have to change immediately, and the government will have to make clear how they intend to follow the order with respect to all of the ways in which immigrants here and abroad are being affected at the moment.”

Since it was first rolled out a week ago, Trump’s travel ban has been evolving — both because of legal challenges and as a result of decisions by the administration to walk back aspects of it. Green-card holders from the affected countries, for example, no longer need waivers to get into the United States, as they did when the order took effect. And the Department of Homeland Security have asserted that the order does not apply to dual citizens with passports from countries other than the seven listed.

The numbers of visas revoked, too, demonstrated the far-reaching impact of the order. Families have been split, students unable to pursue their education, and those in the United States unable to leave for fear of not being able to return — and not by the handful, but by the tens of thousands.

During a hearing in a lawsuit by two Yemeni brothers who arrived at Dulles International Airport last weekend and were quickly put on a return flight to Ethiopia because of the new restrictions, a Justice Department lawyer said 100,000 visas had been revoked.

The figure, though, was immediately disputed by the State Department, which said the number of visas revoked was roughly 60,000. A spokesperson had said earlier that the revocations would have no impact on the legal status of people already in the United States, but if those people left the country, their visas would no longer be valid.

About the same time, in Boston, a group of four students enrolled in area colleges, a researcher and the spouse of a permanent resident — all of whom came from countries affected by the ban — flew into the United States.

The group that entered was aboard the same flight from Frankfurt operated by the German airline Lufthansa, which a day earlier had noted on its website a court decision from last weekend that it claimed had “suspended” Trump’s decree on flights to Boston. Lawyers hailed the development as good news.

Among those who made their way back to the United States were two undergraduate Massachusetts Institute of Technology students who had been visiting their families for a winter break; as well as 27-year-old Behnam Partopour, a PhD student from Iran studying chemical engineering at Worcester Polytechnic Institute who had been working on a project in Germany; and Samira Asgari, an Iranian scientist who was headed to Boston to conduct research at Brigham and Women’s Hospital.

Washington and Minnesota had filed a broad legal challenge to Trump’s order, alleging it was “separating families, harming thousands of the States’ residents, damaging the States’ economies, hurting State-based companies, and undermining both States’ sovereign interest in remaining a welcoming place for immigrants and refugees.” Jeffrey P. Bezos, the owner of The Washington Post and a Washington state resident, has spoken out against the ban.

In the past several days, federal judges in New York, California, Massachusetts and Virginia have issued rulings temporarily blocking aspects of the Trump order — though the orders all seemed to be limited to people who had made their way to U.S. airports, or, in Virginia’s case, to certain people.

The New York and Massachusetts rulings both blocked the government from detaining or deporting anyone from the seven affected countries who could legally enter the U.S., and the Massachusetts ruling added the critical phrase “absent the executive order.” In California, a judge declared that U.S. officials were also prevented from “blocking” people from entering who had a valid visa.