The exact nature of the charges was unclear on Friday because the indictment remained under seal, but they stem from payments made during the 2016 presidential campaign to silence claims of an extramarital sexual encounter.

Prosecutors said they were working to coordinate Mr Trump’s surrender, which could happen early next week.

They did not say whether they intended to seek prison time in the event of a conviction, a development that would not prevent Mr Trump from seeking and assuming the presidency.

It becomes the first ever criminal case against a former US president

The indictment, the first against a former US president, injects a local district attorney’s office into the heart of a national presidential race and ushers in criminal proceedings in a city that the ex-president for decades called home.

Arriving at a time of deep political divisions, the charges are likely to reinforce rather than reshape duelling perspectives of those who see accountability as long overdue and those who, like Mr Trump, feel the Republican is being targeted for political purposes by a Democratic prosecutor.

Mr Trump, who has denied any wrongdoing and has repeatedly assailed the investigation, called the indictment “political persecution” and predicted it would damage Democrats in 2024.

In a statement confirming the charges, defence lawyers Susan Necheles and Joseph Tacopina said Mr Trump “did not commit any crime”, adding: “We will vigorously fight this political prosecution in court.”

A spokesman for the Manhattan district attorney’s office confirmed the indictment and said prosecutors had reached out to Mr Trump’s defence team to coordinate a surrender.

Mr Trump was asked to surrender on Friday but his lawyers said the Secret Service needed additional time as they made security preparations, two people familiar with the matter told The Associated Press. The people, who could not publicly discuss security details, said Mr Trump is expected to surrender early next week.

District attorney Alvin Bragg left his office on Thursday evening without commenting.

The case centres on well-chronicled allegations from a period in 2016 when Mr Trump’s celebrity past collided with his political ambitions.

Prosecutors for months scrutinised money paid to porn actor Stormy Daniels and former Playboy model Karen McDougal, whom he feared would go public with claims that they had extramarital sexual encounters with him.

The timing of the indictment appeared to come as a surprise to Mr Trump’s campaign officials, following news reports that criminal charges were likely weeks away. The former president was at Mar-a-Lago, his Florida estate, on Thursday and filmed an interview with a conservative commentator earlier in the day.

For a man whose presidency was defined by one obliterated norm after another, the indictment sets up yet another never-before-seen spectacle — a former president having his fingerprints and mug shot taken, and then facing arraignment.

For security reasons, his booking is expected to be carefully choreographed to avoid crowds inside or outside the courthouse.

The prosecution also means that Mr Trump will have to simultaneously fight for his freedom and political future, while also fending off potentially more perilous legal threats, including investigations into attempts by him and his allies to undo the 2020 presidential election as well as into the hoarding of hundreds of classified documents.

In fact, New York was until recently seen as an unlikely contender to be the first place to prosecute Mr Trump, who continues to face long-running investigations in Atlanta and Washington that could also result in charges.

Unlike those inquiries, the Manhattan case concerns allegations against Mr Trump that occurred before he became president and are unrelated to his much-publicised efforts to overturn the election.

The indictment comes as Mr Trump seeks to reassert control of the Republican Party and stave off a slew of one-time allies who may threaten his bid for the presidential nomination.

An expected leading rival in the race, Florida Governor Ron DeSantis, called the indictment “un-American” in a statement on Thursday night that pointedly did not mention Mr Trump’s name.

In bringing the charges, Mr Bragg, the Manhattan district attorney, is embracing an unusual case that was investigated by two previous sets of prosecutors, both of which declined to take the politically explosive step of seeking Mr Trump’s indictment.

The case may also turn in part on the testimony of a key witness, Mr Trump’s former lawyer and fixer Michael Cohen, who pleaded guilty to federal charges arising from the hush money payments, including making false statements.

The probe’s fate seemed uncertain until word got out in early March that Mr Bragg had invited Mr Trump to testify before a grand jury, a signal that prosecutors were close to bringing charges.

Mr Trump’s attorneys declined the invitation, but a lawyer closely allied with the former president briefly testified in an effort to undercut Mr Cohen’s credibility.

Mr Trump himself raised anticipation that he would be indicted soon, issuing a statement earlier this month in which he predicted an imminent arrest and called for protests.

He did not repeat that call in a fresh statement on Thursday, but the New York Police Department told its 36,000 officers to be fully mobilised and ready to respond to any potential protests or unrest.

Late in the 2016 presidential campaign, Mr Cohen paid Ms Daniels 130,000 dollars to keep her silent about what she says was a sexual encounter with Mr Trump a decade earlier after they met at a celebrity golf tournament.

Mr Cohen was then reimbursed by Mr Trump’s company, the Trump Organisation, which also rewarded the lawyer with bonuses and extra payments logged internally as legal expenses. Over several months, Mr Cohen said, the company paid him 420,000 dollars.

Earlier in 2016, Mr Cohen also arranged for the publisher of the supermarket tabloid the National Enquirer to pay Ms McDougal 150,000 dollars to squelch her story of a Trump affair in a journalistically dubious practice known as “catch-and-kill”.

The payments to the women were intended to buy secrecy, but they backfired almost immediately as details of the arrangements leaked to the news media.

Federal prosecutors in New York ultimately charged Mr Cohen in 2018 with violating federal campaign finance laws, arguing that the payments amounted to impermissible help to Mr Trump’s presidential campaign.

Mr Cohen pleaded guilty to those charges and unrelated tax evasion counts and served time in federal prison.

Mr Trump was implicated in court filings as having knowledge of the arrangements — obliquely referred to in charging documents as “Individual 1” — but US prosecutors at the time balked at bringing charges against him.

The Justice Department has a long-time policy against indicting a sitting president in federal court.

Mr Bragg’s predecessor as district attorney, Cyrus Vance Jr, then took up the investigation in 2019. While that probe initially focused on the hush money payments, Mr Vance’s prosecutors moved on to other matters, including an examination of Mr Trump’s business dealings and tax strategies.

Mr Vance ultimately charged the Trump Organisation and its chief financial officer with tax fraud related to fringe benefits paid to some of the company’s top executives.

The hush money matter became known around the DA’s office as the “zombie case”, with prosecutors revisiting it periodically but never opting to bring charges.

Mr Bragg saw it differently. After the Trump Organisation was convicted on the tax fraud charges in December, he brought fresh eyes to the well-worn case, hiring long-time white-collar prosecutor Matthew Colangelo to oversee the probe and convening a new grand jury.

Mr Cohen became a key witness, meeting with prosecutors nearly two-dozen times, turning over emails, recordings and other evidence and testifying before the grand jury.

Mr Trump has long decried the Manhattan investigation as “the greatest witch hunt in history”. He has also lashed out at Mr Bragg, calling the prosecutor, who is black, racist against white people.

Donald Trump expected to surrender next week following indictment