"One thing I know a lot about is the legal definition of fraud," Justice Arthur Engeron said as he gaveled court into session prior to the start of opening statements.

Engoron opened the proceedings after allowing cameras in to document the scene in the courtroom: Trump, arms folded, flanked by his legal team; Engeron on the bench; and throngs of reporters and spectators in the gallery.

"I've promised to do my best despite my lame attempts at humor," Engeron said in a brief opening statement. "I take my job very seriously."

The trial is expected to last through Dec. 22, Engeron said, and suggested he would attempt to keep a low profile after today.

"For the next three months, I hope the only words I will mutter are 'Sustained,' 'Overruled,' and 'Let's take a 10-minute break,'" he said.

Opening statements are underway in former President Trump's $250 million fraud trial.

Trump is seated between his attorneys Clifford Robert, Alina Habba and Christopher Kise.

Trump and his co-defendants face a bench trial, meaning that the sole arbiter of the case is Judge Arthur Engoron instead of a jury.

Former President Trump has taken a seat in the courtroom for the start of the trial.

"The crime is against me," he told reporters outside the courtroom before he made his way inside.

He denounced the case in now-familiar terms, criticizing state Attorney General Letitia James as she sat inside the courtroom.

Trump also accused Judge Arthur Engoron of failing to account for the full value of his real estate portfolio, asserting his Mar-a-Lago estate is worth "50 to 100 times more" than the judge's decision for partial summary judgment said last week.

"We have other properties, the same thing. So he devalued everything," Trump said. "We have among the greatest properties in the world. and I have to go through this for political reasons."

Engoron decided Trump's statements of financial condition were fraudulent, but Trump said, "We have a clause in the contract that says, essentially, buyer beware."

Former President Trump, speaking to reporters on his arrival at the lower Manhattan courthouse, said the trial is a witch hunt resulting from his standing in the presidential polls.

"This is a continuation of the greatest political witch hunt of all time," he told reporters outside the courtroom.

Trump said he is innocent of the accusations and that his portfolio has a much higher value than what the attorney general alleges.

Day 13 of the trial is scheduled to get underway this morning with continued testimony from Ladder Capital executive Jack Weisselberg, who took the stand yesterday afternoon.

The son of former Trump Organization CFO Allen Weisselberg, who is a defendant in the case, Jack Weisselberg said yesterday that he often worked directly with his father while working on a 2015 deal to refinance the Trump Organization's $160 million mortgage of its 40 Wall Street office building.

The younger Weisselberg also described interactions with the Trump Organization executives who worked to protect the sensitivity of Trump's financial information.

"I think they were concerned about confidentiality and wanted to make sure it got into my hands," said Jack Weisselberg, describing how Trump's financial documents were sent to him via a messenger.

He also testified how, when Trump Organization executives were contemplating a 2012 loan, they appeared sensitive about making certain financial documents public -- including how much fashion brand Gucci paid in rent at Trump Tower.

"He is also nervous about Gucci's rent becoming public knowledge, as he tends to embellish from time to time," Jack Weisselberg wrote in a 2012 email that was entered into evidence, apparently referring to Trump.

"I recall it being public was a concern," Jack Weisselberg said when asked about the information referenced in the email.