Before today's first witness entered court, Trump attorney Chris Kise asked Judge Engoron to postpone today's proceedings after five members of the New York attorney general's team tested positive for COVID-19.

Describing the attorney general's conduct as "beyond irresponsible," Kise said that his team did not get adequate notice about the COVID exposures despite having close contact with positive individuals.

"Nothing else matters except for pursuing President Trump," Kise said. "We have the leading candidate for president of the United States in the courtroom today."

"The attorney general's office knew on Wednesday and didn't tell any of us," defense attorney Clifford Robert said. "We are truly in an outbreak."

Engoron declined to grant their requested delay.

In a statement, a spokesperson for New York Attorney General Letitia James said the state has complied with all CDC guidelines.

"Our office properly notified the court and defendants' counsel, and the court decided to proceed with trial today. If there were any concerns, defendants could wear masks today or at any point, but they have opted not to," the spokesperson said.

Trump called his former lawyer Michael Cohen a "proven liar" and "felon" as Trump entered the courtroom for his civil trial this morning.

"He's a felon, served a lot of time for lying, and we're just going to go in and see and I think you'll see that for yourself," Trump told reporters outside court.

Cohen pleaded guilty in 2018 to two separate criminal cases and eventually spent more than 13 months in prison -- but said that it was Trump who caused him to "follow a path of darkness."

-ABC News' Ricardo Montero contributed to this report.

Exiting his New York City apartment this morning, Michael Cohen told reporters he was "looking forward" to seeing Trump in court.

"It's been five years since we've been in the same room," Cohen said.

Cohen preemptively defended the credibility of his testimony and reiterated that he previously perjured himself "concert with and for the benefit of Donald J. Trump."

"My credibility should not be in question," Cohen said.

-ABC News' Eric Avram contributed to this report.

Donald Trump has arrived in court for the anticipated testimony of his former lawyer Michael Cohen.

New York Attorney General Letitia James is also attending the trial this morning.

James took her usual seat at the front of the courtroom's gallery, directly behind her team of lawyers at the counsel table.

The courtroom itself is nearly at capacity, with attendance matching the number of observers during the trial's opening statements.

Trump Hotels chief operating officer Mark Hawthorn disputed an August 2023 report from the Trump Organization's independent monitor that said the company continued to provide incomplete information to lenders.

Hawthorn had earlier testified that the monitor never communicated that they "uncovered fraud or any irregularities."

State attorney Andrew Amer confronted Hawthorn with the letter from the Trump Organization's independent monitor Barbara Jones flagging inconsistencies.

"Were you aware that Judge Jones had identified such inconsistencies?" Amer asked.

"Yes," Hawthorn answered -- but said that he stood by his initial statement that the monitor never uncovered fraud, claiming that the flagged issues were consistent with accounting practices.

"Did the monitor accuse the Trump Organization of disseminating false and misleading information?" defense attorney Clifford Robert asked on redirect examination.

"No," Hawthorne said.

Trump defense attorney Chris Kise used the disagreement about the monitor's findings to renew his request to question Jones, which Judge Engoron denied earlier in the afternoon.

"What the monitor thinks is clearly and squarely at issue," Kise said, describing the Trump Organization's issues as "minor accounting discrepancies which happen in a large corporation all the time."

"Every time you talk, there's a campaign speech," Engoron quipped following Kise's lengthy argument.

Engoron ultimately stood by his initial ruling, but said he would allow Kise to present cases, if they exist, supporting the defense's right to call the monitor.

"I will decide what reports mean and what implications there are," Engoron said about the monitor's findings.