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

After a week-long selection process, the jurors in Donald Trump's New York hush money case are scheduled to hear opening statements this morning in the first criminal trial of a former U.S. president.

To prove their case, lawyers for Manhattan District Attorney Alvin Bragg need to convince twelve jurors beyond a reasonable doubt that Trump repeatedly falsified records to unlawfully influence the 2016 presidential election.

"This case has nothing to do with your personal politics or your feelings about a particular political issue," prosecutor Joshua Steinglass told prospective jurors on Thursday. "It's not a referendum on the Trump presidency, a popularity contest, or any indication of who you plan to vote for this fall. This case is about whether this man broke the law."

Trump's lawyers are expected to focus their efforts on going after the credibility of prosecution witnesses, suggesting the case itself is politically motivated and arguing that the former president never intended to commit a crime.

Donald Trump's alleged violations of the court-imposed limited gag order "pose a very real threat to the integrity of the judicial proceedings," prosecutor Christopher Conroy said during the hearing on whether Trump should be held in contempt.

In addition to the 10 alleged gag order violations, Conroy said the district attorney's office would file an additional contempt motion later today about comments Trump made to cameras on Monday about Michael Cohen.

Among Trump's comments: "Because as you know, Cohen is a lawyer -- represented a lot of people over the years -- now, I'm not the only one. And he wasn't very good in a lot of ways, in terms of his representation, but he represented a lot of people."

"And also, the things he got in trouble for were things that had nothing to do with me. He got in trouble and went to jail. This had nothing to do with me. This had to do with the taxi-cab company that he owned, which is something -- and medallions and borrow money and a lot of things but had nothing to do with me. He represented a lot of people over the years."

"And when are they going to look at all the lies that Cohen -- did -- in the last trial. He got caught lying in the last trial. So he got caught lying -- pure lying. And when are they going to look at that?"

Conroy told the judge that Trump has "violated this order repeatedly and hasn't stopped."

Conroy said Trump's conduct is "all part of his plan for this trial," accusing the former president of "conditioning his followers" by making derogatory remarks about potential witnesses.