One week ahead of her planned testimony, Ivanka Trump has appealed Judge Engoron's decision to require her to testify in person at the Trump Organization's fraud trial.

Ivanka Trump's lawyer Bennet Moskowitz asked an appellate court to decide whether Engoron has jurisdiction to compel her testimony and whether the trial subpoenas issued by the New York attorney general were properly served.

Ivanka Trump, who is not a defendant in the case, is currently scheduled to testify next Wednesday as the final witness in the attorney general's case before the defense presents its case.

Donald Trump Jr. has arrived at the New York State Supreme Courthouse with his attorney.

Unlike his father and his brother Eric Trump -- who have visited the courtroom to watch the proceedings – Donald Trump Jr. has not stepped foot inside the courthouse for the trial until today.

A Trump Organization executive vice president, Trump Jr. is scheduled to testify in the case this afternoon.

Defense lawyer Jesus Suarez spent the first hour of his cross-examination working to cast doubt on expert Michiel McCarty's analysis, which found that Trump defrauded lenders out of $168 million in interest.

"Who created the universe of documents for you to review? It was the New York attorney general, right?" Suarez said before launching into a rapid-fire succession of questions regarding which lenders McCarty had spoken to in the course of his analysis.

"Did you ever interview anyone from Deutsche Bank?" Suarez asked.

"No," McCarty said.

"Did you ever interview anyone from Ladder Capital?" Suarez asked.

"No," McCarty repeated.

"Did you ever interview anyone from Mazars," Suarez asked.

"No," McCarty responded.

"Did you ever interview anyone from the Trump Organization?" Suarez asked.

"No," McCarty said again.

Only 15 minutes into what is expected to be a three-hour cross-examination, Judge Arthur Engoron snapped at defense lawyer Jesus Suarez for asking redundant questions.

"I see why this is going to take two or three hours. Some questions become three or four more questions," Engoron said, interrupting the cross-examination to request that Suarez shorten his questions.

That prompted Trump lawyer Chris Kise to criticize Engoron for placing an unfair standard on the defense team.

"You never give them speeches. You never limit their questions," Kise said about Engoron's approach to the attorney general's legal team. "I think it's unfair."

Kise stressed that the cross-examination of the state's sole expert witness is particularly important since his testimony is likely to play into the judge's calculation of Trump's potential fine.

"This witness is the only witness they have that even hints ... about ill-gotten gains," Kise said.

Engoron, however, refused to back down.

"I stand by my rulings and statements," the judge said.

When the Trump Organization valued its Seven Springs compound in New York's Westchester County at $261 million, the company included seven mansions, estimated to be worth $23 million each, that had not been built, longtime Trump Organization controller Jeff McConney testified.

In contrast, an appraiser had said Seven Springs was worth $56 million, excluding development rights for the property, which hadn't been awarded.

McConney testified that he did not factor into the valuation when, or whether, the homes would be built.

"You have treated, for the purposes of this valuation, a profit of $23 million per home as if it were realized immediately?" asked Andrew Amer with the New York attorney general's office.

"Correct," McConney said.

Amer said that Trump Organization VP Eric Trump, in a call with McConney the following year, instructed McConney to continue to value the seven mansions the same as he did in 2013.

McConney is testifying as a hostile witness since he is also a named defendant in the case. It gives Amer wider latitude in his examination, though defense attorneys have made several objections about leading questions.

The proceedings were briefly interrupted by the blaring of a horn that was audible in the courtroom, prompting Amer to interrupt his questioning and remark, "Someone is having a celebration."

Judge Engoron, who has displayed a dry wit throughout the trial, responded, "Maybe they're celebrating us."