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.

Ivanka Trump must appear to testify at her father’s fraud trial, Judge Arthur Engoron decided from the bench Friday morning.

“I want to see her in person. That is how we prefer testimony,” Engoron said after denying Ivanka Trump’s motion to quash the trial subpoenas she was served.

While Ivanka Trump was not in attendance at Friday's hearing, her lawyer Bennet Moskowitz argued that the state’s justification for bringing Ivanka to the courtroom “falls on its face.”

Characterizing the state’s argument as “a bridge too far,” Moskowitz reiterated that Ivanka neither lives nor has done business in New York since 2017.

State attorney Kevin Wallace defended the subpoenas by arguing Ivanka Trump was a former Trump Organization executive who was the main contact with lenders for Trump’s Washington D.C. Old Post Office hotel. Wallace added that Ivanka Trump still owns properties in New York and operates business here.

Ruling from the bench after a short break, Engoron found that the state presented sufficient evidence to prove that Ivanka does business in New York.

“Ms. Trump owns property in New York and has done business in New York,” he said.

Engoron added that her testimony should not be scheduled before next Wednesday to allow her lawyers to appeal his ruling.

“A trial is a search for the truth, and the law is entitled to every person’s evidence,” Engoron said.