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

A prospective juror who went through questioning but was ultimately excused from the case told ABC News outside the courthouse that she didn't like the former president, but that it was important he get a fair trial.

"I don't like him, I don't approve of what he did as president," said Kara McGee, when asked by ABC News about her feelings on Trump. "But the right to a fair trial is extremely important. And if this would serve to uphold that, then that would be my priority."

McGee was excused from the case because of scheduling conflicts with her job.

"No matter what you think about someone as a person, or what other things they may have done, what he is on trial for is a very specific thing that even he deserves the right to a fair trial," she said.

Asked about the sentiment of the other prospective jurors on their opinions of Trump, McGee said it "seemed pretty even, surprisingly."

"I thought because this is Manhattan it might be a little bit more liberal, but there were a number of people who said 'Yes, I listen to Fox, I watch Fox, I have been on Trump mailing lists in the past,'" she said. "So not really leaning towards one side or the other, that I can tell."

"You got a sense that people were really trying to put anything that they had brought to this aside, and step in and do their civic duty," she said. "And that people really were being honest."