Judge Juan Merchan announced there is an issue with Juror No. 9 -- who, according to Merchan, "was concerned about media attention" of the case. According to Merchan, the juror "wasn't 100% sure" they could serve.

Merchan said they would speak to the juror in chambers to "find out what the issue is and see if this juror can continue to serve."

After a brief sidebar, the judge announced: “Juror No. 9 is going to remain with us.”

There are six alternate jurors seated in case any of the 12 jurors cannot serve.

On his way into the courtroom for the day's proceedings, Trump once again alleged that the trial constitutes election interference, claiming that the proceedings are unfairly keeping him off the campaign trail.

"Everybody knows that I'm here instead of being able to be in Pennsylvania and Georgia and lots of other places campaigning, and it's very unfair," he told reporters.

"It's a very, very sad day in America," he said. "I can tell you that."

The former president is seated at the defense table between his lawyers Todd Blanche and Emil Bove.

-Mike Pappano

The proceedings are underway in former President Donald Trump's hush money trial. Trump and Manhattan District Attorney Alvin Bragg are both in the courtroom.

Three prosecutors -- Joshua Steinglass, Matthew Colangelo, and Susan Hoffinger -- are seated at the counsel table.

Bragg is seated in the front row of the gallery with approximately a dozen lawyers and staff from his office.

The first witness prosecutors with the Manhattan DA's office plan to call is former National Enquirer publisher David Pecker, according to two sources familiar with the matter.

ABC News previously reported that prosecutors planned to call Pecker as a witness, but sources now say he's expected to be the first witness to take the stand.

Pecker served as the longtime chief executive of American Media Inc., which published the National Enquirer.

Shortly after Trump announced his 2016 presidential campaign, Pecker met with Trump and agreed to act as the "eyes and ears" of the campaign by looking out for and killing negative stories about Trump, according to the Manhattan DA.

As part of the arrangement, Pecker allegedly directed a deal to pay $30,000 to a former Trump Tower doorman regarding the false allegation that Trump allegedly fathered a child out of wedlock, prosecutors say. Then-Trump attorney Michael Cohen allegedly insisted that the deal stay in place even after AMI discovered the allegation was false, and AMI paid the doorman, according to the Manhattan DA.

-Katherine Faulders

Asked to share her responses to the jury questionnaire, one prospective alternate said she wanted to "jump ahead" to Question 34, which asks whether any strong opinions of Trump would interfere with the ability to be fair.

"The last day, after some introspection, I don't think I can be impartial," the woman said. "I had every intention when I first started, but I think after the questions posed to prospective jurors and asking the questions to myself, I don't think I can be impartial."

Judge Merchan excused her without objection from the attorneys.

A prospective alternate who works for the New York City Law Department said in response to a question that she had read Trump's "Art of the Deal." Trump, who appeared to have his eyes closed, opened them right away at that response and looked at the woman.

The woman also said she had been sexually assaulted "a couple of times on the train."

Trump also appeared to have been chewing on something. He has been conferring with defense attorney Emil Bove throughout the more mundane parts of the questionnaire responses.

A chef for a "large hospitality group" said he follows the White House account on Instagram, "so when Mr. Trump was president, obviously I was receiving updates." Trump turned his head to look at the man after he had been slumped over the defense table looking down.