NEW YORK — The FBI raided the office and hotel room of President Trump’s longtime personal lawyer, Michael D. Cohen, on Monday, seizing business records, e-mails, and documents related to several topics, including payments to a pornographic film actress.

Trump, in an extraordinarily angry response, lashed out hours later at what a person briefed on the matter said was an investigation into possible bank fraud by Cohen. Trump accused his own Justice Department of perpetrating a “witch hunt’’ and asserted that the FBI “broke into’’ Cohen’s office.

The president, who spoke at the White House before meeting with senior military commanders about a potential missile strike on Syria, called the FBI raid a “disgraceful situation’’ and an “attack on our country in a true sense.’’

It is not clear how the FBI entered Cohen’s office, but agents had a search warrant and typically would have presented it to office personnel to be let in. The documents identified in the warrant date back years, according to a person briefed on the search.

Potential campaign finance violations are also part of the inquiry, The Washington Post reported.

The prosecutors obtained the search warrant after receiving a referral from the special counsel in the Russia investigation, Robert Mueller, according to Cohen’s lawyer, who called the search “completely inappropriate and unnecessary.’’

The search does not appear to be directly related to Mueller’s investigation but most likely resulted from information that he had uncovered and gave to prosecutors in New York.

“We’ll see what may happen,’’ Trump said Monday. “Many people have said you should fire him.’’

The president once again denounced Jeff Sessions, the attorney general, for recusing himself in the Russia inquiry and blasted the FBI for failing to investigate Hillary Clinton, “where there are crimes.’’ He criticized Rod J. Rosenstein, the deputy attorney general, who is overseeing the Russia investigation, and called Mueller’s team “the most biased group of people,’’ who he said were mostly Democrats and some Republicans who had worked for President Obama.

“That is really now on a whole new level of unfairness,’’ Trump said.

Cohen’s lawyer, Stephen Ryan, confirmed the raids. “Today the US attorney’s office for the Southern District of New York executed a series of search warrants and seized the privileged communications between my client, Michael Cohen, and his clients,’’ Ryan said.

Cohen’s payments to the pornographic film actress, Stephanie Clifford, who is known as Stormy Daniels, are only one of many topics being investigated by the prosecutors in New York, according to a person briefed on the search. The FBI also seized tax documents and business records, the person said.

Agents raided space Cohen uses in the Rockefeller Center office of the law firm Squire Patton Boggs, as well as a room Cohen is staying at the Loews Regency Hotel on Park Avenue while his apartment is under renovation, the person said.

In order to obtain a search warrant, prosecutors must convince a federal judge that agents are likely to discover evidence of criminal activity.

The searches are a significant intrusion by prosecutors into the dealings of one of Trump’s closest confidants, and they pose a dilemma for Trump. He has dismissed Mueller’s investigation as a “witch hunt,’’ but these warrants were obtained by an unrelated group of prosecutors. The searches required prior consultation with senior members of Trump’s own Justice Department.

The searches open a new front for the Justice Department in its scrutiny of Trump and his associates: His longtime lawyer is being investigated in Manhattan; his son-in-law, Jared Kushner, is facing scrutiny by prosecutors in Brooklyn; his campaign chairman, Paul Manafort, is under indictment; his former national security, adviser Michael Flynn has pleaded guilty to lying; and a pair of former campaign aides are cooperating with Mueller.

Mueller, meanwhile, wants to interview Trump about possible obstruction of justice.

The special counsel is also investigating a payment made to President Trump’s foundation by a Ukrainian steel magnate for a talk during the campaign, according to three people briefed on the matter. The inquiry is part of a broader examination of streams of foreign money to Trump and his associates in the years leading up to the election.

Investigators subpoenaed the Trump Organization this year for an array of records about business with foreign nationals. In response, the company handed over documents about a $150,000 donation that the Ukrainian billionaire, Victor Pinchuk, made in September 2015 to the Donald J. Trump Foundation in exchange for a 20-minute appearance by Trump that month through a video link to a Kiev conference.

Cohen solicited the donation, which was the largest the foundation received in 2015 from anyone besides Trump himself.

Regarding the search warrants for Cohen, it is not clear what Mueller saw that made him refer the matter to other prosecutors. But the searches show that Mueller does not believe he has the authority to investigate all manners of allegations against everyone in Trump’s orbit.

Cohen is a longtime lawyer and fixer who, in a decade at Trump’s side, has served as a reliable attack dog against real or perceived threats to Trump. His activities have been scrutinized as part of Mueller’s investigation into Russian interference in the 2016 election.

Cohen recently paid $130,000 to Clifford, who said she had an affair with Trump. Clifford has said she was paid before the election to buy her silence. She is challenging a nondisclosure agreement she signed barring her from discussing the matter.

The search is an aggressive move for the Justice Department, which normally relies on grand jury subpoenas to obtain records from people who are represented by lawyers and are cooperating with authorities.

Search warrants are more often used in cases in which prosecutors do not trust people to preserve or turn over the records themselves. Justice Department rules require prosecutors to first consider less intrusive alternatives before seeking records from lawyers.

The searches of Cohen’s documents hearken to the pre-dawn FBI raid of the home of Manafort’s. Those documents helped underpin his indictment last fall on money laundering, tax, and foreign lobbying charges.

Ryan said Cohen has cooperated with authorities and turned over thousands of documents to congressional investigators looking into Russian election meddling.

The seized records include communications between Trump and Cohen, which would likely require a special team of agents to review because conversations between lawyers and clients are protected from scrutiny in most instances.

Though Mueller’s team did not initiate the search, if prosecutors in Manhattan uncover information related to Mueller’s inquiry they can share that with Mueller’s team.

A Long Island native, Cohen began his career as a personal injury lawyer and taxi fleet manager. He joined the Trump Organization in 2006.

It is not clear how significant prosecutors view the payment to Clifford. Trump has denied knowing about the payment. And Cohen has said he paid Clifford out of his own money. Asked last week why Cohen made the payment, Trump replied: “You’ll have to ask Michael Cohen. Michael is my attorney, and you’ll have to ask Michael Cohen.’’

Dawn Dearden, spokeswoman for the US attorney’s office for the Southern District of New York, declined to comment on the search warrant.