Judge Juan Merchan plans to issue a ruling tomorrow about the bounds of Donald Trump's cross-examination if the former president decides to testify during the trial.

After hearing a brief oral argument this afternoon, Merchan told the parties he is reserving his decision, which he plans to issue sometime tomorrow.

Prosecutor Matthew Colangelo argued that Trump's alleged prior bad acts as demonstrated by a variety of civil and criminal determinations should be fair game during cross-examination.

The Sandoval hearing on Trump's potential testimony got underway with prosecutors pushing to cross-examine former president Donald Trump about his alleged violation of the limited gag order in his civil fraud trial.

Prosecutor Matthew Colangelo asked Judge Merchan to permit them to ask the former president about his testimony during his civil fraud trial when the former president claimed he was not referring to Judge Arthur Engoron's law clerk during remarks in the hallway of the courthouse last year.

Engoron determined that Trump's brief testimony rang "hollow and untrue."

Colangelo asked Merchan to allow cross-examination about Trump's testimony and the gag order violation last year in order to probe his credibility.

"He lied," Colangelo said of Trump. "It is very hard to think of something more probative of a testifying defendant's credibility."

Judge Juan Merchan began the court's afternoon session but did not mention the self-immolation incident this afternoon in the park across from the courthouse, and Trump did not respond to questions about the incident when asked by a reporter in the hallway outside the courtroom.

The judge plans to hold a Sandoval hearing this afternoon to determine the bounds of Trump's cross-examination if he decides to testify.

In a filing earlier this week, prosecutors said they planned to question the former president about his past civil cases, including $464 million business fraud judgment, the defamation and battery cases brought by E. Jean Carroll and a lawsuit Trump filed against Hillary Clinton claiming she conspired to rig the 2016 election.

Prosecutors also want to question Trump about the Trump Organization's 2022 criminal trial for tax evasion and the civil case against the Trump Foundation for misusing charitable donations to further Trump's political interests.

Trump is seated at counsel table between his lawyers Emil Bove and Todd Blanche. Manhattan District Attorney Alvin Bragg is not present in the courtroom.

Former President Trump has filed a new emergency appeal to change the venue of his criminal trial.

Oral arguments are scheduled for this afternoon to determine whether the trial should be temporarily paused.

The motion is expected to cite some of the responses prospective jurors gave during the jury selection process.

Trump's prior attempts to move the trial out of Manhattan have failed.

Donald Trump is "not just our former president, he's not just Donald Trump that you've seen on TV," said defense attorney Todd Blanche in his opening statement.

"He's also a man. He's a husband," Blanche said. "He's a father."

Blanche pushed back on the DA's overall allegation that the payments to Trump's attorney Michael Cohen were weren't only payback for Stormy Daniels by using the prosecutor's own words against him.

Blanche noted that Cohen paid $130,000 to Daniels, but that Trump paid back Cohen a total of $420,000. If Trump really was a frugal businessman, as prosecutors said, why would he overpay that money, Blanche asked.

"Ask yourself, would a frugal businessman, a man who pinched his pennies, repay a $130,000 debt to the tune of $420,000?" Blanche asked.

Blanche repeatedly reiterated that Cohen truly was an attorney for Trump and was doing legal work for him, pointing out that Michael Cohen's own email signature noted he was Trump's attorney.

"None of this was a crime," Blanche said, saying the 34 counts against Trump "are really just 34 pieces of paper."