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

Several more prospective jurors have moved on to the next round of the screening process after some were excused after saying they could not serve impartially.

Among those who remain following the initial questionnaire are a senior living professional from the Upper West Side, a native Mexican who became a U.S. citizen in 2017, a corporate lawyer who lives in Chelsea, and a Disney employee.

A twice-married man who lives in Battery Park earned a tight smile from former President Trump when he said he had read some of his books, including "The Art of the Deal." He said he read that book, as well as "How to be Rich" and a third title that he couldn't quite remember, prompting a chuckle from Trump.

He said that relatives on his wife's side lobby and fundraise for the Republican Party, and that he followed Trump on Twitter during his presidency.

"I don't think there's anything that would prevent me from being a fair and impartial juror," the man said. "I feel that no one is above the law."

He said, however, that he "would be lying" if he said he would promise not to discuss the case "to some degree" with his wife. When the judge said he could say nothing of substance, the man replied, "That would be tough."

The man also said his daughter was the victim of a violent sexual assault that he described as "traumatic," but he said it left him with a "generally favorable view of the legal system."

Trump has largely remained engaged during the process, reviewing what appears to be a copy of the jury questionnaire and keeping watch over the prospective jurors as they tick through their answers.

But at times, like on Monday, he has been observed shutting his eyes, allowing his chin to slouch, then quickly jerking it back up.