As the Trump administration faced off against a group of states and their allies — including high-ranking former national security officials and much of the tech industry — a federal appeals court in San Francisco called a hearing Tuesday on whether to reinstate the president’s ban on travel to the United States from seven Muslim-majority countries.

With the Supreme Court ideologically divided at 4-4 since the death of Justice Antonin Scalia nearly a year ago, the decision by the Ninth U.S. Circuit Court of Appeals is likely to determine whether President Trump’s Jan. 27 executive order will remain suspended for now.

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Jayashri Srikantiah, a professor of immigration law at Stanford, said the judge’s decision, which returned admission of immigrants and refugees into the U.S. to the screening procedures in effect before Jan. 27, had restored relative calm to the nation’s borders and airports after days of “chaos and anguish” that followed Trump’s order.