WASHINGTON — A top federal prosecutor in Manhattan stepped down from his position Saturday after the Trump administration fired him.

U.S. Attorney Geoffrey S. Berman of the Southern District of New York said in a statement that Attorney General William Barr’s decision “to respect the normal operation of law and have Deputy U.S. Attorney Audrey Strauss become Acting U.S. Attorney” led to his decision. He said it would be “effective immediately.”

Berman and Barr had been in an increasingly nasty standoff after meeting in Manhattan on Friday. Afterward, the Justice Department announced Berman had resigned. Berman denied it, and he went to work Saturday.

The Trump administration on Saturday fired Berman, escalating tensions with the high-profile office that has overseen numerous investigations into President Trump’s allies. Attorney General William Barr said Trump personally issued the order; the president denied he was involved.

The extraordinary clash between the White House and U.S. Attorney Geoffrey S. Berman fueled new accusations of political interference in the Justice Department, particularly given that Berman’s office is engaged in an ongoing investigation into Trump’s personal attorney, Rudy Giuliani.

Barr set off a whirlwind chain events on Friday night with a surprise announcement that Berman was resigning.

But hours later, the prosecutor said he would not step down, and his investigations would continue. He arrived at his office Saturday morning, telling reporters: “I’m just here to do my job.”

He’d planning to fight the decision even after Barr’s letter, but that possibility was becoming less clear as the day wore on.

The situation was made more complicated by the fact that Berman was never formally nominated for his position by Trump and instead appointed by a federal court. Berman argued that as a result, federal law allows for him to stay on the job until a presidential nominee is confirmed by the Senate. Earlier Saturday, Sen. Lindsey Graham, a close Trump ally and chair of the Senate Judiciary committee, suggested he would not rubber-stamp a new nominee.

However, it appears Trump is able to circumvent the confirmation requirement by firing Berman and putting his deputy in charge effective immediately.

Barr sent a letter to Berman on Saturday, informing him he was formally fired, hours after he showed up to work, telling reporters, “I’m just here to do my job.”

The administration’s push to cast aside Berman set up an extraordinary political and constitutional clash between the Justice Department and one of the nation’s top districts, which has tried major mob and terrorism cases over the years. It also deepened tensions between the department and congressional Democrats, who have accused Barr of politicizing the agency and acting more like Trump’s personal lawyer than the country’s chief law enforcement officer.

Only days ago, allegations surfaced from former Trump national security adviser John Bolton that the president sought to interfere in an investigation by Berman’s office into the state-owned Turkish bank in an effort to cut deals with Turkish President Recep Tayyip Erdoğan.

In his letter to Berman, Barr said he expected to continue speaking with him about other possible positions within the department and was surprised by the statement he released.

“Unfortunately, with your statement of last night, you have chosen public spectacle over public service,” Barr wrote, adding that the idea that Berman had to continue on the job to safeguard investigations was “false.”

“Your statement also wrongly implies that your continued tenure in the office is necessary to ensure that cases now pending in the Southern District of New York are handled appropriately,” he wrote. “This is obviously false.”

Although Barr said Trump had removed Berman, the president told reporters: “That’s all up to the attorney general. Attorney General Barr is working on that. That’s his department, not my department.” Trump added: “I wasn’t involved.”

Barr offered no explanation for his action. The White House announced that Trump was nominating Securities and Exchange Commission Chairman Jay Clayton, a well-connected Wall Street lawyer with virtually no experience as a federal prosecutor, for the job.

People familiar with the matter in the Southern District could point to no clear reason for Berman’s removal, though they noted his job had always seemed in jeopardy and Berman was never given the sense that it was secure.

Berman’s office also took actions on some important cases without first informing Washington. But the various investigations are ongoing and no charges seem imminent, said the people familiar with the matter, who weren’t authorized to publicly discuss the matter and spoke to The Associated Press on condition of anonymity.

A senior department official said Clayton was planning to leave the administration, wanted to move back to New York and expressed interest in the Southern District position, and Barr thought he would be a good fit. The official was not authorized to publicly discuss internal department matters and spoke on condition of anonymity.

The chairman of the Senate Judiciary Committee, Sen. Lindsey Graham, R-S.C., said he was unlikely to proceed with Clayton’s nomination unless New York’s senators, Democrats Chuck Schumer and Kirsten Gillibrand, gave their consent to the pick. Schumer said the bid to oust Berman “reeks of potential corruption of the legal process,” and Gillibrand said she would “not be complicit” in helping fire a prosecutor investigating corruption. Both lawmakers called for Clayton to withdraw from consideration.

The chairman of the House Judiciary Committee, Rep. Jerry Nadler, D-N.Y., said his committee was inviting Berman to testify this coming week. Schumer called for the department’s inspector general and Office of Professional Responsibility to investigate.

Berman’s statement Friday night said he would stay on the job until a nominee was confirmed by the Senate. He challenged Barr’s power to remove, given that Berman was appointed by federal judges, not by the president, and the White House never formally nominated him. Under federal law, a U.S. attorney who is appointed by district court judges can serve “until the vacancy is filled.”

But the Justice Department’s Office of Legal Counsel argued in a 1979 opinion that the “power to remove a court-appointed U.S. attorney rests with the president.” It says, “The president is responsible for the conduct of a U.S. Attorney’s office and therefore must have the power to remove one he believes is an unsuitable incumbent, regardless of who appointed him.”

Barr said in his letter that the deputy U.S. attorney, Audrey Strauss, would take over the top job until a permanent successor is in place.

Federal prosecutors in New York have overseen numerous prosecutions and investigations with ties to Trump in recent years. That includes an ongoing investigation into Giuliani’s business dealings, including whether he failed to register as a foreign agent, according to people familiar with the matter. They were not authorized to discuss the investigation publicly and spoke on the condition of anonymity.

The office has also prosecuted a number of Trump associates, including Trump’s former personal lawyer and fixer Michael Cohen, who served a prison sentence for lying to Congress and campaign finance crimes. Cohen was recently released from a federal prison to continue serving his sentence on home confinement over coronavirus concerns.

Berman has overseen the prosecution of two Florida businessmen, Lev Parnas and Igor Fruman, who were associates of Giuliani and tied to the Ukraine impeachment investigation. The men were charged in October with federal campaign finance violations, including hiding the origin of a $325,000 donation to a group supporting Trump’s reelection.

A Republican who contributed to the president’s election campaign, Berman worked for the same law firm as Giuliani and was tapped as U.S. attorney by the Trump administration. In that role, he won over some skeptics after he went after Trump allies.

Under Berman’s tenure, his office also brought charges against Michael Avenatti, the combative lawyer who gained fame by representing porn actress Stormy Daniels in lawsuits involving Trump. Avenatti was convicted in February of trying to extort Nike after prosecutors said he threatened to use his media access to hurt Nike’s reputation and stock price unless the sportswear giant paid him up to $25 million.