Former President Donald Trump has left his Doral, Florida, golf club to motorcade to the Miami federal courthouse for his 3 p.m. appearance.

Some supporters with Trump flags lined the street outside Doral.

Miami Mayor Francis Suarez told ABC News that the crowd outside the courthouse "seems manageable" ahead of former President Donald Trump's arrival.

"Everything seems, right now, very calm. We are hopeful that it remains that way," he said.

As negotiations reach final stages, ABC News has learned from sources that former President Donald Trump is not expected to be handcuffed or be required to empty his pockets when he's processed at the courthouse on Tuesday.

Trump is also not expected to have a mugshot taken, according to sources.

His hands are expected to be scanned electronically, sources added.

Trump will be asked for his name and social security number when he's processed, a law enforcement official told reporters.

The booking process is not expected to take long, a law enforcement official said, adding that it's "the same process that everyone goes through."

-ABC News' Katherine Faulders, Aaron Katersky and John Santucci

Of all the federal charges that former President Donald Trump and his aide Walt Nauta face in the investigation into the alleged mishandling of top secret government documents, obstruction is one of the most serious, according to legal experts.

Claire Finkelstein, the founder and faculty director of the Center for Ethics and the Rule of Law at the University of Pennsylvania’s Annenberg Public Policy Center, noted that the obstruction charges in the indictment against Trump and his aide carry as much serious weight as the charges related to keeping the top secret documents, with a maximum penalty of 20 years in prison.

Finkelstein said an obstruction charge can cover a broad range of alleged activities, from as simple as lying to investigators, to as major as destroying evidence. But she said it all comes down to one clear allegation: that the accused deliberately interfered with an ongoing criminal investigation.

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-ABC News' Ivan Pereira

Defense attorney Todd Blanche entered a not guilty plea on behalf of former President Donald Trump.

Trump was frowning at some points and was looking down toward the floor for most of the hearing.

Trump was already in the courtroom by about 2:45 p.m., ahead of the scheduled 3 p.m. start time. Seated at the same table as Trump was his aide and co-defendant, Walt Nauta.

Trump waited in the courtroom for about 10 minutes before the judge arrived.

At first Trump appeared slumped in his chair, but when the judge asked for him to be officially arraigned, the former president sat up a bit and crossed his arms.

At one point during the arraignment, the magistrate judge asked Trump's lawyers Todd Blanche and Chris Kise if they were permanent attorneys, and they indicated they were.

Trump was barred from speaking to any witnesses about the case, except through counsel.

The court did not impose restrictions on Trump’s travel and his passport was not revoked. There will also be no limitations on his ability to possess a firearm.

Nauta did not enter a plea because he does not have local representation. He's set to return to court on June 27.

Trump never looked back at Smith during the hearing. Trump left the room before the special counsel.