NEW YORK — The fight between the feds and Apple has been turned up a notch.

The government on Friday asked a judge to force Apple to help the FBI access an iPhone used by one of the San Bernardino shooters.

The FBI’s request “presents no danger for any other phone and is not ‘the equivalent of a master key capable of opening hundreds of millions of locks,'” the Department of Justice wrote in a court document.

The Justice Department accuses Apple of resisting a federal magistrate-judge’s order out of “concern for its business model and public brand marketing strategy.”

The filing was the latest turn in the high-stakes legal fight between the Obama administration and one of the world’s most powerful tech companies.

The government says it needs Apple’s help in its investigation into last year’s terror attacks, in which 14 people were killed. Apple argues to do so would threaten the privacy of its customers.

Apple did not issue a public comment Friday. A senior Apple executive, speaking anonymously, said the government is overreaching. The executive said the company fears that giving in to the FBI’s demand in this case could set a bad precedent.

Apple CEO Tim Cook has argued that complying with the order will hurt both the company and its customers by making all iPhones less secure.

The court decision at issue was issued this week by U.S. Magistrate Judge Sheri Pym. Apple has until February 26 to respond formally in court. It then has several legal steps ahead of it and could continue to appeal all the way to U.S. Supreme Court.

Other leading tech companies, including Google, Twitter and Facebook, have voiced support for Apple’s position. But it has been criticized by politicians ranging from Republican Presidential candidate Donald Trump to Democratic U.S. Sen. Diane Feinstein.