The earliest possible day that former Trump attorney Michael Cohen could testify is next Monday, Judge Engoron said.

Cohen, who for years was Trump's so-called "fixer," said an ongoing medical issue had forced him to postpone his testimony, which was originally scheduled to begin tomorrow.

Judge Engoron noted that he has not yet received Cohen's "all-important doctor's note," but that he hopes to receive it sometime today.

Trump attorney Chris Kise criticized the delayed appearance of Cohen, who he described as central to the state's case -- noting that Cohen has continued to post to social media despite his medical issue.

"He does continue to be active in his pursuit of my client," Kise said. "He does not appear to be that infirm."

Trump Organization executive Patrick Birney testified that then-CFO Allen Weisselberg told him that Trump wanted to see his net worth "go up."

"Did Allen Weisselberg ever tell you that Mr. Trump wanted his net worth on the statement of financial condition to go up?" state attorney Eric Haren asked Birney.

"Yes," Birney said. "I think that happened in Allen Weisselberg's office."

Birney said the meeting with Weisselberg happened sometime between 2017 and 2019, but could recall a specific date.

The testimony prompted a quick objection from Trump attorney Chris Kise, who pushed back on claims from the New York attorney general that there was a conspiracy between Trump Organization employees to inflate Trump’s net worth.

"They are mixing hearsay and the conspiracy," Kise argued.

Judge Engoron asked both parties to submit two-page memos by tomorrow about whether the statements from Birney are hearsay.

Trump's lawyers declined to cross-examine Birney, who stepped down from the stand, clearing the way for Trump Hotels chief accounting officer Mark Hawthorn to testify.

On the heels of former Trump attorney Michael Cohen's decision to delay his testimony, Judge Engoron said that "the schedule for the rest of this week is somewhat up in the air."

The judge, however, promised to offer clarity about the trial schedule later today.

Engoron also acknowledged the anticipated return on Tuesday of former President Trump to the courtroom.

When the judge, while waiting for a witness to enter, joked about arguing before an empty chair, defense attorney Chris Kise replied, "It won't be empty tomorrow."

Engoron responded with a smile, saying "So I hear."

The civil fraud trial of former President Trump, his adult sons, and Trump Organization executives enters its third week with a notable schedule change.

Trump's former lawyer and so-called "fixer" Michael Cohen, who was initially scheduled to begin his testimony on Tuesday, has delayed his court appearance due to a preexisting medical condition.

"I look forward to testifying and correcting the record as to the multiple misstatements and responses by previous witnesses who stated … 'I don't recall.' Unfortunately for them, I do," Cohen told ABC News on Saturday.

Trump is expected to attend multiple days of the trial beginning on Tuesday, according to sources familiar with his plans.

In the meantime, Trump Organization executive Patrick Birney is expected to conclude his testimony this morning.

Birney is scheduled to be followed on the stand by Mark Hawthorn, the chief accounting officer at Trump Hotels.

Testifying for the defense, former President Trump's eldest son described his father as a real estate "visionary" who "sees the sexiness in a real estate project," creating value for the family business that cannot be captured on paper.

Donald Trump Jr. began his testimony with a quip after Judge Engoron welcomed him back to the stand following his testimony earlier in the month.

"I'd say it's good to be here, but the attorney general would probably sue me for perjury," Trump Jr. joked.

In his testimony, Trump Jr. described the Trump Organization as "a large family business," with Trump and his eldest children at the top and other executives handling many of the details.

"If there were numbers and things, I would rely on them to give me that," Trump Jr. said.

He recounted the history of the Trump Organization, beginning with his great-grandfather who he said built hotels in the Yukon Territories of Canada. His grandfather, Fred Trump, "started working on job sites around Queens, learned the trades" and eventually "created an incredible portfolio, by the time of his passing, of rental apartments in Brooklyn and Queens."

A state attorney jokingly objected that references to the 1800s were outside the statute of limitations -- then more seriously objected to the history lesson's relevance.

"I think it is relevant to get the historical perspective -- I find it interesting," Judge Engoron said in overruling the objection. "Let him go ahead and say how great the Trump Organization is."

Trump Jr. obliged.

"My father learned a lot of the business from him, but had some flair and saw New York City and Manhattan as the ultimate frontier," he said. Speaking of Trump Tower, he said, "I think it would have been one of the first, I think great, ultra-luxury real estate emerging in Manhattan."