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

Trump attorney Todd Blanche sought to "test" jury candidates on their assurances that his client would "get a fair shake" as he began his questioning of the first group of prospective jurors.

"This isn't a baseball game," Blanche said, referring to a sports reference Assistant District Attorney Josh Steinglass had made during his questioning of jurors. "This is extraordinarily serious."

Blanche pressed jurors on their opinion of Trump, asking each of them whether they harbored any views about him in any capacity -- political or otherwise.

"If we were sitting in a bar, I'd be able to tell you," said the bookseller from the Upper West Side. But in the courtroom, he continued, that opinion has "absolutely no bearing on the case."

"I walk in here, and he's a defendant," he said. "That's all he is."

When another juror indicated that her awareness of Trump comes in part through the lens of her gender -- "I'm a female," she said -- Blanche asked her to elaborate.

"I know that there have been opinions on how he doesn't treat females correctly, stuff like that," she said. "I honestly don't know the story. So I don't have a view on it."

Another juror, an older male, drew laughter from courtroom when he said Trump "makes things interesting."

"I find him fascinating. He walks into a room, and he sets people off," the juror said. "I find that really interesting."

"Um, all right," Blanche said. "Thank you."