Former President Donald Trump left the courtroom at 3:25 p.m., nearly one hour after entering the room at 2:28 p.m.

Former President Donald Trump has pleaded not guilty to 34 felony counts of falsifying business records, according to a source in the courtroom. Trump entered the not guilty plea himself, sources said.

Trump waited in the courtroom for at least five minutes before Judge Juan Merchan arrived, and rose when the judge said, “all rise.”

“Let’s arraign Mr. Trump, please," Merchan said.

Trump spoke quietly when he addressed the judge, including when he entered his not guilty plea.

Prosecutors asked for a protective order on the discovery materials, which would prevent Trump from disseminating those records.

Todd Blanche, Trump’s new defense attorney, at one point said, “I didn’t realize we were going to be giving opening statements.”

Blanche said Trump was “frustrated” and “upset” and had a right to express his views publicly.

The judge said he was not going to enact a gag order.

-ABC News' Katherine Faulders, Olivia Rubin, Laura Romero and John Santucci

A photo has been released of former President Donald Trump sitting between his attorneys at the defense table.

Still cameras were permitted to take photos in the courtroom before the hearing began, but Judge Juan Merchan barred video cameras from the proceedings.

Former President Donald Trump has entered a Manhattan courtroom for an unprecedented arraignment.

Trump didn't speak to the press as he headed into the courtroom at 2:28 p.m., nearly one hour after he entered the courthouse at 1:23 p.m.

Manhattan District Attorney Alvin Bragg was brought into the courtroom before him, escorted in under the protection of officers.

In Trump's attorneys' first public comments following Tuesday's arraignment, Todd Blanche said "there were no surprises" in the indictment and that they "plan to fight it hard."

Trump is "upset and frustrated and disappointed and mad that this happened," Blanche told reporters outside the Manhattan courthouse.

Joe Tacopina, another Trump attorney, called the case insufficient and said the unsealing of the indictment "shows that the rule of law died in this country."

"While everyone is not above the law, no one's below it either," Tacopina said. "And if this man's name was not Donald J. Trump, there is no scenario we'd all be here today."