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

"Do you know someone by the same of Stephanie Clifford?"

The question, by assistant district attorney Josh Steinglass, was the jury's introduction during the evidentiary phase of the trial to the woman whose long-denied claim of a sexual tryst with Donald Trump set in motion the alleged falsification of business records.

"Stormy Daniels is, or was, a porn star," former National Enquirer publisher David Pecker replied, using Clifford's stage name.

Pecker was having dinner with his wife on a Saturday night in early October 2016 when he said he received an urgent call from National Enquirer editor Dylan Howard.

"He said that she, she being Stormy Daniels, is trying to sell a story that she had a sexual relationship with Donald Trump, and Dylan can acquire the story for $120,000 from Keith Davidson if we made a decision right now," Pecker recalled.

In a series of text messages the jury saw, Howard told Pecker, "I know denials were made in the past but this story is true."

Pecker replied to Howard, "We can't pay 120k." The company had already paid $30,000 for the Dino Sajudin story and $150,000 for the Karen McDougal story, and Pecker recalled thinking, "I am not a bank."

In the text exchange, Howard responded, "Perhaps I call Michael and advise him and he can take it from there, and handle."

Pecker texted back, "Yes a good idea."

Pecker recalled having "a number of conversations" with Michael Cohen about Stormy Daniels. Cohen wanted Pecker to catch and kill the story.

"I said, 'I am not purchasing this story, I am not going to get involved with a porn star,'" Pecker testified he told Cohen. "He was upset and said the boss would be furious with me."