Donald Trump, in New York, had a prep session with his lawyers Sunday ahead his testimony, sources tell ABC News.

Trump's mood during the session fluctuated between fits of anger regarding the case and being "in a good head space," according to sources.

The former president "can be a good witness if he stays focused," one source said.

Former President Trump is due in court to begin his testimony in his $250 million civil fraud trial at 10 a.m. ET.

Hundreds of members of the news media are huddled outside the New York State Supreme Courthouse ahead of Trump's arrival, with some having waited overnight.

After multiple in-court disputes about communications between him and his law clerk, Judge Arthur Engoron modified his limited gag order to cover attorneys in former President Donald Trump's civil fraud trial.

"Defendants may reference my staff as is appropriate to ask about scheduling issues or the management of the trial, which is an integral part of their jobs. What they may not do is to make any further statements about internal and confidential communications (be it conversations, note passing, or anything similar) between me and my staff," Engoron wrote in his supplemental limited gag order on Friday.

Engoron wrote that defense lawyers Chris Kise, Alina Habba, and Clifford Robert made "repeated, inappropriate remarks about my Principal Law Clerk, falsely accusing her of bias against them and of improperly influencing the ongoing bench trial."

The attorneys have raised multiple arguments during the trial that Engoron and his clerk passing notes between each other suggests impropriety and is distracting. Going forward, if the lawyers want to object to communications with his clerk, Engoron advised that they refer to the order as a "blanket statement."

"This gag order is as narrowly tailored as possible to accomplish its purpose, which is to protect the safety of my staff and promote the orderly progression of this trial," Engoron said.

To justify the safety threat, Engoron added that his chambers has received "hundreds of harassing and threatening phone calls, voicemails, emails, letters, and packages" since the start of the trial,

The judge threatened "serious sanctions" for violations of the extended order.

Standing in the courthouse hallway where his father earlier railed against his civil trial, Eric Trump echoed his father's attacks on the New York attorney general and the case levied against his family, following the adjournment of court for the day.

"We have an unbelievable company. We have some of the best assets anywhere in the world. We've never had a default. We've never missed a payment," Eric Trump said of the Trump Organization.

Like his father, he described the case as politically motivated and decried the involvement of his family.

"They've dragged Don and I and Ivanka into it as collateral damage," he said.

Later, addressing reporters on the courthouse steps, he said that the state's efforts should be focused elsewhere.

"Let's get the murderers off the street. Let's take care of the crime. Let's rebuild our infrastructure. Everywhere you drive in New York, you hit a pothole and your car gets destroyed," he said.

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.