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.

An attorney for Judge Arthur Engoron also filed in support of the gag order in Donald Trump's civil fraud trial, arguing that violent threats have increased since the gag order was lifted.

The limited gag order, which prohibited Donald Trump and his attorneys from publicly commenting about Engoron's staff, was issued by the judge last month after Trump posted about the judge's law clerk on social media. Judge David Friedman of the appellate division's First Department stayed the order on Thursday, citing constitutional concerns over Trump's free speech rights.

Engoron's filing includes a report from Charles Hollon of the Judicial Threats Assessment Unit of the New York State Court System's Department of Public Safety. According to the report, Engoron and his principal law clerk, Allison Greenfield, have been inundated with credible, violent and antisemitic threats since Trump began criticizing Greenfield.

"The threats against Justice Engoron and Ms. Greenfield are considered to be serious and credible and not hypothetical or speculative," Hollon wrote in the report.

Greenfield has been the victim of daily doxing of her personal email address and phone number, receiving dozens of calls, emails and social media messages daily, according to Hollon. Approximately half the harassing messages have been antisemitic, according to Greenfield.

In the report, Hollon wrote that Engoron was the subject of credible threats before the trial had started, but Trump's Oct. 3 Truth Social post directed at Greenfield exponentially increased the number of threats directed at her.

The report included multiple examples of voicemails that were left on the telephone in Engoron's chambers.

Hollon said the messages have created an "ongoing security risk" for Engoron, his staff and family, but that the gag order had been effective in lowering the number of threats.

"The implementation of the limited gag orders resulted in a decrease in the number of threats, harassment and disparaging messages that the judge and his staff received," Hollon said in the report. "However, when Mr. Trump violated the gag orders, the number of threatening, harassing and disparaging messages increased."

Engoron's lawyer, Lisa Evans, said the threats detailed in Hollon's affirmation justify the gag order, which functions as a reasonable limit on free speech.

"The First Amendment does not prohibit courts from limiting speech that threatens the safety of the court's staff," Evans wrote.

Trump's reply to the filing is due on Nov. 27, after which the First Department will decide whether to fully lift the gag order.