The People of the State of New York v. Donald J. Trump, et al, is scheduled to get underway in lower Manhattan at 10 a.m. with opening statements.

If opening statements are completed before the end of the day, the New York attorney general plans to begin her case by calling Trump's former Mazars USA accountant Donald Bender to the stand.

Mazars severed its business relationship with the former president last year after learning of the attorney general's findings during the AG's probe.

Though Trump has denied all wrongdoing alleged by the attorney general, Judge Arthur Engoron has already decided the central allegation against Trump and his co-defendants, ruling in a pretrial hearing last week that the AG had provided "conclusive evidence" that Trump overvalued his assets between $812 million and $2.2 billion.

The judge then canceled the Trump Organization's business certificates in New York, severely restricting Trump's ability to conduct business in the state moving forward -- a move that Trump attorney Alina Habba called "nonsensical" and "outrageously overreaching."

"In defendants' world: rent regulated apartments are worth the same as unregulated apartments; restricted land is worth the same as unrestricted land; restrictions can evaporate into thin air," Engoron wrote, citing multiple arguments made by defense to justify the allegedly inflated valuations of Trump's assets. "That is a fantasy world, not the real world."

Among the issues still to be determined at trial: What additional penalties Trump might face, and what might happen with the multiple causes of action included in the attorney general's suit.

Former President Donald Trump stepped up his attacks on the judge overseeing and deciding his case, writing on Truth Social overnight that Justice Arthur Engoron should resign and be sanctioned for "abuse of power."

Similar to an earlier post, Trump criticized allegations regarding the value of his Mar-a-Lago estate, in addition to an appellate court's ruling that his lawyers unsuccessfully tried to use to limit the timeframe of the case.

Former President Trump posted on his Truth Social platform Sunday night that he intends to attend the opening of the trial.

"See you in court -- Monday morning," he wrote in a post.

Earlier Sunday, multiple sources familiar with the decision told ABC News that Trump was expecting to attend.

Trump will have no speaking role in court on Monday, but it is anticipated that he'll return to the courthouse toward the end of the state's case when court records show he will be called as a witness.

Lawyers for the New York attorney general, in a late-day court filing, said they support the court-ordered pause on canceling Trump's business certificates -- but warn that a stay of Trump's civil fraud trial would cause a "cascade of delays."

The filing comes more than three weeks after an appeals court, at Trump's request, paused the enforcement of the cancelation of Trump's business certificates that Judge Arthur Engoron had ordered in his summary judgment.

In today's filing, New York Attorney General Letitia James wrote she was "willing to agree to stay enforcement … pending the end of trial and entry of final judgment."

On the other parts of Trump's appeal -- including the request to delay the trial and arguments against Engoron's summary judgment ruling that Trump committed fraud -- James vehemently argued in favor of letting the trial run its course.

"Abruptly halting trial would thus sow chaos and result in an inordinate waste of both public resources and the time and resources of witnesses," James wrote, alleging that Trump is playing courts against one another to create delays.

"Moreover, any delay here would threaten a cascade of delays not only in this case but also in other pending criminal and civil cases against defendant Donald J. Trump," the filing said.

Trump's legal team has until Nov. 9 to submit their reply.