Jurors will deliberate until 4:30 p.m. ET today if they don't reach a verdict sooner, Judge Merchan said.

"You cannot leave the building and you need to be able to get here quickly" when a verdict is reached, the judge told the parties after the jury had left the courtroom.

Former President Trump got up from the defense table and spoke with several associates, then exited the courtroom with his entourage.

The staff and lawyers from the Manhattan district attorney's office also left the courtroom.

As the 12 main jurors left the courtroom, most appeared to look away from Trump as they passed his counsel table.

The six alternate jurors remained in the courtroom after the 12 main jurors left to begin deliberations.

"We are not going to excuse you just yet," Judge Merchan told the alternates,

He asked them to stick around through the deliberations. though they won't participate in the deliberations themselves.

"That concludes my instructions on the law. Counsel please approach," Judge Merchan said when he was done instructing the jury.

He held a sidebar with the attorneys, after which the jurors filed out of the courtroom to begin deliberations.

Judge Merchan emphasized that jurors each need to come to an individual decision about the verdict after hearing and understanding the view of the other jurors.

"Each of you must decide the case for yourself, but only after a fair and impartial consideration of the evidence with the other jurors," Merchan said.

"You should discuss the evidence and consult with each other, listen to each other, give the others' views careful consideration," he said. "You should not surrender an honest view of the evidence simply because you want the trial to end, or because you're outvoted."

"Your verdict on each count you consider must ... be unanimous -- that is, each and every juror must agree to it," Merchan said.

Merchan said that the jury foreperson will read the verdict for each of the charged counts. Merchan will then poll the entire jury to confirm their verdict.

While the jury deliberates, Trump -- from the courthouse -- posted to social media about the readback that the jury just heard.

During the readback, the jury heard former National Enquirer publisher testify about a June 2016 phone call he had with Trump after Playboy model Karen McDougal came forward with a story of a year-long affair with Trump, which Trump has steadfastly denied.

"This story about Karen, since she's claiming that she has a relationship with you, should be taken off the market," Pecker recounted telling Trump -- to which Trump replied, "I don't normally -- I don't buy stories because it always gets out."

"I still think you should buy the story," Pecker testified that he told Trump, to which Trump replied, "I'll speak to Michael, and he'll get back to you."

In his social media post, Trump said, "Testimony conclusively showed that I clearly stated, "I DON'T BUY STORIES!" -- Not that there would be anything wrong with doing that -- NDA's [nondisclosure agreements] are PERFECTLY LEGAL AND COMMON!"

Pecker testified that the National Enquirer eventually paid McDougal $150,000 to catch and kill her story so it would not become public, under the expectation that the money would be reimbursed by Trump -- although the reimbursement never materialized.

-Kelsey Walsh