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.

As Donald Trump Jr. prepares to return to the witness stand this morning, New York Attorney General Letitia James says the Trump Organization executive VP has been been with the Trump Organization for a long time for someone who appears to have so little understanding of the business.

In a video posted to social media last night following Trump Jr.'s first day of testimony, James said the eldest son of former President Trump "claimed to have very little understanding of the accounting and legal mechanics of the family business -- but we know he has been involved in running the Trump Organization for a long time."

Trump Jr. testified yesterday that he relied on the expertise of others when he signed his father's statements of financial condition, distancing himself from the documents at the heart of the attorney general's case.

While he acknowledged that he had some of the "the most intimate knowledge" about some of the deals described in the statements, Trump Jr. reiterated that he did not have a role in putting the documents together.

"The accountants worked on it. That's what we pay them to do," Trump Jr. said.

Trump Jr. will return to the witness stand this morning, with his bother Eric Trump on deck to testify later today.