Donald Trump is set to fly from his estate in Florida to New York ahead of his scheduled court hearing on Tuesday.
The former US president faces charges relating to hush-money payments made to a porn star before the 2016 election.
Police erected barricades outside Trump Tower over the weekend, with demonstrations expected both there and at the courthouse in Lower Manhattan.
Mr Trump, 76, is expected to arrive on Monday evening and will spend the night in Manhattan.
The exact charges he faces are not yet known but they will be read in full when he appears at the Manhattan Criminal Courts Building at around 14:15 (19:15 BST) on Tuesday.
Some reports suggest the indictment includes around 30 charges related to a $130,000 (£105,000) pay-out to adult film star Stormy Daniels that was made in an attempt to buy her silence over an alleged affair in 2006. The pay-out was made just before the 2016 presidential election, which Mr Trump won over Hillary Clinton.
Two people familiar with the matter told the Associated Press Mr Trump is facing multiple charges of falsifying business records – including at least one felony offence, which would be a more a serious charge.
“I will be leaving Mar-a-Lago on Monday at 12 noon, heading to Trump Tower in New York,” Mr Trump wrote on his social media platform Truth Social.
The former president will be escorted by members of the US Secret Service and will reportedly fly to New York’s LaGuardia Airport on his personal plane.
After spending the night in Trump Tower, where extra security measures have been put in place, he will travel to the courthouse with a large Secret Service detail and surrender voluntarily. He is not expected to be handcuffed.
The former president will experience standard arrest procedure – being fingerprinted and photographed before investigators complete the usual paperwork and check for outstanding warrants.
He will then appear before a judge, who will read the indictment – the set of charges – to him. His lawyers have already said he will plead not guilty.
A group of news organisations, including the New York Times and the Associated Press, have asked that cameras be allowed into the courtroom during the hearing. They have also asked the judge to unseal the indictment and make it public due to the “overwhelming public interest”.
Mr Trump is expected to be released on bail and will return to his Florida home, Mar-a-Lago, on Tuesday evening, where he plans to deliver remarks at 20:15 local time.
He is the first US president in history to be charged with a crime, but has repeatedly denied wrongdoing.
The years-long investigation has been led by Manhattan District Attorney Alvin Bragg, a registered Democrat, who Mr Trump says is leading a “political prosecution” aimed at damaging his run for the presidency in 2024.
“We’re ready for this fight. And I look forward to moving this thing along as quickly as possible to exonerate him,” one of his lawyers, Joe Tacopina, told ABC News on Sunday.
Mr Trump’s prospective court appearance comes as he faces numerous other criminal investigations.
The bills are expected to generate about GH¢4 billion annually.
On Monday, the Washington Post reported that federal investigators had gathered new evidence suggesting Mr Trump may have obstructed the investigation into the handling of top secret documents at Mar-a-Lago. Mr Trump denies wrongdoing.