NEW YORK (AP) — Former President Donald Trump surrendered to authorities Tuesday at a Manhattan courthouse ahead of his arraignment on criminal charges stemming from a hush money payment to a porn actor during his 2016 campaign.

Wearing his signature dark suit and red tie, Trump turned and waved to crowds outside the building before heading inside to be fingerprinted and processed — a remarkable reckoning after years of investigations into his personal, business and political dealings and an extraordinary moment in US history.

He arrived at court in an eight-car motorcade that took him from Trump Tower in Midtown Manhattan through the main north-south highway on the east side of the city, past landmarks such as the United Nations. Along the way, the voluble ex-president posted on his social media platform: “Heading to Lower Manhattan, the Courthouse. Seems so SURREAL — WOW, they are going to ARREST ME. Can’t believe this is happening in America. MAGA!”

The booking and appearance before Judge Juan Merchan should be relatively brief — though hardly routine — as Trump learns for the first time the charges against him. Trump will plead not guilty, according to his lawyers, and is expected to enter the plea himself, as is standard in the court.

READ: Donald Trump set to be arraigned in historic court moment

Trump, who was impeached twice by the US House but was never convicted in the US Senate, is the first former president to face criminal charges. The nation’s 45th commander in chief was escorted from Trump Tower to the courthouse by the Secret Service and may have his mug shot taken.

New York police said they were ready for large protests by Trump supporters, who share the Republican former president’s belief that the New York grand jury indictment and three additional pending investigations are politically motivated and intended to weaken his bid to retake the White House in 2024. Journalists often outnumbered protesters, though.

READ: Trump’s expected surrender creates New York spectacle

Trump, a former reality TV star, has been hyping that narrative to his political advantage, saying he raised more than $8 million in the days since the indictment on claims of a “witch hunt.”

His campaign released a fundraising request titled “My last email before arrest” and he has repeatedly assailed the Manhattan district attorney, egged on supporters to protest and claimed without evidence that the judge presiding over the case “hates me” — something his own lawyer has said is not true.

Trump is scheduled to return to his Palm Beach, Florida, home, Mar-a-Lago, on Tuesday evening to give remarks, punctuating his new reality: submitting to the dour demands of the American criminal justice system while projecting an aura of defiance and victimhood at celebratory campaign events. At least 500 prominent supporters have been invited, with some of the most pro-Trump congressional Republicans expected to attend.

A conviction would not prevent Trump from running for or winning the presidency in 2024.

Inside the Manhattan courtroom, prosecutors led by New York’s district attorney, Alvin Bragg, a Democrat, are expected to unseal the indictment issued last week by a grand jury. This is when Trump and his defense lawyers will get their first glimpse of the precise allegations against him.

The indictment contains multiple charges of falsifying business records, including at least one felony offense, two people familiar with the matter told The Associated Press last week.

After the arraignment, Trump is expected to be released by authorities because the charges against him don’t require that bail be set.