WASHINGTON — The Justice Department on Monday evening urged a federal appeals court to reinstate President Donald Trump’s targeted travel ban, saying immediate action was needed to ensure the nation’s safety.

The administration’s brief was the last in a series of urgent pleas to the 9th U.S. Circuit Court of Appeals, in San Francisco, which is set to rule on the most ambitious and disruptive initiative of Trump’s young presidency. The ruling will almost certainly be followed by an appeal to the Supreme Court.

The court scheduled an hourlong oral argument in the case for Tuesday afternoon. That gives at least another day of reprieve to foreign visitors from seven predominantly Muslim countries, as well as other immigrants, who initially were blocked from entering the United States by Trump’s order.

The administration’s brief largely tracked its earlier arguments. But it offered one concession, saying that even if it loses, the appeals court should reinstate at least part of the travel ban.

“At most,” the brief said, the court order blocking the ban should be limited to “previously admitted aliens who are temporarily abroad now or who wish to travel and return to the United States in the future.” That would allow the federal government to block people who have never visited the United States.

On Monday, Sean Spicer, White House press secretary, said the administration stood ready to reinstate the entire ban. “Once we win the case, it will go right back into action,” he said.

In his own remarks Monday, Trump said the United States should admit “people that love us and want to love our country and will end up loving our country” and not “people that want to destroy us and destroy our country.”

Many trial judges around the country have blocked aspects of Trump’s executive order, which suspended travel from the seven mostly Muslim countries and limited the nation’s refugee program, but none of those cases have reached an appeals court. And none of the lower-court rulings were as broad as the one under review in the case, State of Washington v. Trump.

The 9th Circuit scheduled the oral argument in the case for 3 p.m. Pacific time Tuesday. It is to take place by telephone, and the court said it would be live-streamed on its website. Holding an oral argument by telephone in a major case is unusual.

The case will be heard by Judge William C. Canby Jr., appointed by President Jimmy Carter; Judge Michelle T. Friedland, appointed by President Barack Obama; and Judge Richard R. Clifton, appointed by President George W. Bush.

At issue is the earlier ruling, by Judge James L. Robart, a federal judge in Seattle, that blocked the key parts of Trump’s executive order. Robart’s ruling allowed immigrants and travelers who had been barred from entry to come to the United States, and it inspired a harsh attack from Trump, who accused the judge of endangering national security.

On Saturday, the administration asked the 9th Circuit for an immediate administrative stay of Robart’s ruling without hearing from the plaintiffs in the case, the states of Washington and Minnesota. The court declined, instead asking for more briefs.

Opponents of Trump’s targeted travel ban made three kinds of arguments in their submissions to the appeals court, saying that the ban is unlawful, that it represents bad national-security policy, and that it is a threat to the nation’s economy.

A brief from Washington and Minnesota, filed early Monday, said “President Trump unleashed chaos by signing the executive order.”

Fifteen states and the District of Columbia — including New York, California, Massachusetts and Virginia — filed a supporting brief to argue that allowing the ban to stand would “cause harm to the states, including to state institutions such as public universities, to the businesses that sustain our economies, and to our residents.”

In a brief filed Saturday, the Trump administration argued that Robart’s order would cause irreparable harm to national security.

In response, lawyers for Washington and Minnesota said that was not plausible, because it would mean the nation had long been suffering “some unspecified, ongoing irreparable harm.”

“That makes no sense,” the brief said. “As this court has held, preserving the status quo against sudden disruption is often in the interest of all parties.”

On Monday, the Trump administration responded that the states were asking the courts “to take the extraordinary step of second-guessing a formal national-security judgment made by the president himself pursuant to broad grants of statutory authority.”

In its earlier brief, the Trump administration urged the 9th Circuit to reject arguments based on religious discrimination, even though Trump has said he meant to favor Christian refugees. Judicial consideration of the president’s motives, the administration’s brief said, would violate the separation of powers.

The states responded that “courts have both the right and the duty to examine defendants’ true motives.”

They added that the administration had taken “a dizzying number of positions” on whether the executive order applied to permanent residents holding green cards. The order appears to cover such people, but the administration has said it will not enforce that part of the order.

Questions about permanent residents are not moot, the states’ brief said, as the administration could again change positions.

Several former diplomatic and national security officials filed a declaration making a second kind of argument.

“We view the order as one that ultimately undermines the national security of the United States, rather than making us safer,” the declaration said. “In our professional opinion, this order cannot be justified on national security or foreign policy grounds.”

The officials filing the declaration included John Kerry, a secretary of state under Obama; Madeleine K. Albright, who held the same position under President Bill Clinton; Susan E. Rice, Obama’s national security adviser; and Leon E. Panetta, secretary of defense and director of the CIA under Obama.

Trump’s order, the officials said, would endanger U.S. troops and intelligence sources, disrupt counterterrorism and law enforcement efforts, damage the economy and have “a devastating humanitarian impact.”

“And apart from all of these concerns,” the officials said, “the order offends our nation’s laws and values.”

The third front in the legal battle against Trump’s order was opened by the technology industry and other businesses.

More than 100 companies, including Apple, Facebook and Google, urged the 9th Circuit to continue to block Trump’s order, saying the order “harms the competitiveness of U.S. companies.”

The “instability and uncertainty” created by the order, the brief said, “will make it far more difficult and expensive for U.S. companies to hire some of the world’s best talent — and impede them from competing in the global marketplace.”

This story was written by Adam Liptak of The New York Times News Service.

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