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.

A prospective juror who went through questioning but was ultimately excused from the case told ABC News outside the courthouse that she didn't like the former president, but that it was important he get a fair trial.

"I don't like him, I don't approve of what he did as president," said Kara McGee, when asked by ABC News about her feelings on Trump. "But the right to a fair trial is extremely important. And if this would serve to uphold that, then that would be my priority."

McGee was excused from the case because of scheduling conflicts with her job.

"No matter what you think about someone as a person, or what other things they may have done, what he is on trial for is a very specific thing that even he deserves the right to a fair trial," she said.

Asked about the sentiment of the other prospective jurors on their opinions of Trump, McGee said it "seemed pretty even, surprisingly."

"I thought because this is Manhattan it might be a little bit more liberal, but there were a number of people who said 'Yes, I listen to Fox, I watch Fox, I have been on Trump mailing lists in the past,'" she said. "So not really leaning towards one side or the other, that I can tell."

"You got a sense that people were really trying to put anything that they had brought to this aside, and step in and do their civic duty," she said. "And that people really were being honest."