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.

After court adjourned for the day, New York Attorney General Letitia James offered one of her firmest repudiations of the former president's claims.

"He can call me names, he can engage in distractions, but at the end of the day ... his entire empire was built on nothing but lies and on sinking sand," James told reporters outside the lower Manhattan courthouse.

Trump has frequently targeted James in his comments during courtroom breaks, criticizing her efforts as politically motivated and pushing an unfounded theory that the case against him is part of a plot of interfere in the 2024 election.

"This is an attorney general ... that went out and campaigned on 'I will get Trump,'" Trump said before entering court this morning, repeating attacks that he's made on social media.

James fired back that her team has repeatedly demonstrated that Trump committed fraud, both in the first two weeks of the trial, as well as in Judge Arthur Engoron's pretrial ruling about Trump's fraudulent financial statements.

"He will again attempt to distract each and every one of you, attempt to raise his voice and scream," James told reporters. "But at the end of the day, justice will be served, and I'm confident that victory will be mine."