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.

Prosecutors asked for a trial date in January 2024.

Donald Trump’s legal team called that timeline “too aggressive” and suggested spring 2024 as an alternative.

Judge Juan Merchan did not weigh in.

Trump's next in-person court appearance is set for Dec. 4. The defense counsel asked the judge to waive Trump’s appearance.

The judge acknowledged that Tuesday's hearing was a “huge undertaking,” but said he would not immediately excuse Trump’s appearance, and said he would deny for the time being the defense counsel’s request “in the interest of transparency.”

-ABC News' Olivia Rubin and Laura Romero