Defense witness David Miller, an expert in insurance underwriting, testified that the Zurich insurance company worked with the Trump Organization largely to protect its relationship with their broker, AON Risk Solutions.

"The relationship with AON was very important, and keeping business intact was very important," Miller said about Zurich, which he said made a "business decision" to insure the Trump Organization's properties.

The testimony appears to be a move to weaken the New York attorney general's allegation that the Trump Organization used their inflated financial statements to get progressively favorable surety terms.

Judge Arthur Engoron was skeptical to qualify Miller as an expert before he relented to the defense's request.

"I don't see why you're an expert in what was just said," Engoron said after Miller spent 20 minutes listing his professional experience.

Both Engoron and state attorney Andrew Amer, who called the testimony a "waste of time," criticized Miller's ability to testify about the decisions made by Zurich and AON.

The defense’s case will likely conclude one week ahead of schedule, according to defense attorney Clifford Robert.

Based on the remaining witnesses, the defense team is now planning to rest its case by Dec. 8.

Once the defense rests its case, the New York attorney general has an opportunity to present a rebuttal case, followed by closing arguments from both sides.

Week 8 of Donald Trump's fraud trial resumes this morning with the defense's sixth expert witnesses.

Apart from the testimony of Donald Trump Jr., the defense's case last week largely relied on multiple experts who supported the claim that asset valuation is more of an art than a science.

Similar to the state's lone expert witness, who was paid $350,000 for his testimony, Trump's expert witnesses during the first week of the defense's case were paid a hefty fee for testifying -- while others testified as a professional courtesy to Trump. Expert witness Gary Giulietti acknowledged his personal friendship with the former president, while Steven Witkoff said he had donated over $2 million to Trump's presidential campaign.

New York Attorney General Letitia James noted those connections in a social media post.

"Several of these experts are longtime friends and golf buddies of Donald Trump. One had donated millions of dollars to Donald Trump's campaign and his son even got married at Mar-a-Lago," she said.

With his limited gag order temporarily lifted on Thursday, Trump is continuing to rail against his civil fraud trial on social media, calling for the prosecution of New York Attorney General Letitia James, Judge Arthur Engoron, and Engoron's law clerk.

Describing the case as a "horribly handled persecution of a political opponent," Trump alleged that Engoron himself committed fraud by undervaluing his assets in his pretrial ruling, and that his clerk and James were complicit in the case.

"The World is watching this illegal Witch Hunt," Trump wrote.

Describing Engoron's clerk as a "co-judge" and "highly partisan," Trump's posts over the weekend were the second and third time the former president took aim at the clerk since an appeals court temporarily lifted the gag order preventing him from attacking Engoron's staff. In both posts, Trump explicitly mentioned the clerk by name.

Engoron on Friday denied Trump's request for a mistrial, which alleged bias on the part of the the judge, writing in his ruling, "As I have made clear over the course of this trial, my rulings are mine, and mine alone. There is absolutely no 'co-judging' at play."

Defense expert Robert Unell testified that both Judge Engoron and Deutsche Bank reached similar conclusions about Donald Trump's actual net worth -- but that Deutsche Bank officials weren't bothered by their determination.

In his partial summary judgment ruling before the trial, Engoron found that the New York attorney general provided "conclusive evidence" that Trump inflated his assets between $812 million and $2.2 billion.

"Even in the world of high finance, this Court cannot endorse a proposition that finds a misstatement of at least $812 million dollars to be 'immaterial,'" Engoron wrote.

Similarly, Deutsche Bank's valuation services group undercut Trump's net worth estimate by roughly than $2.4 billion when they evaluated his 2013 statement of financial condition. Despite that, the bank still loaned Trump millions for three of his properties.

"It would not be unusual," Unell said about the discrepancy identified by the bank.

Engoron cut him off before he could answer whether the discrepancy was within the "adjustment within the range that the court determined."

"I can do the math," Engoron said.