The temperature is rising in Donald Trump's New York criminal trial -- just not in the courtroom itself.

As the parties worked to select the jury Thursday, prosecutors alleged that the former president had violated the limited gag order in the case seven additional times beyond the three instances they flagged on Monday. The accusation came a day after Judge Juan Merchand scolded the former president for muttering within earshot of the jury.

As for the actual temperature, Trump and his attorneys complained it was too cold.

"I'm sitting here for days now from morning till night in that freezing room," Trump told reporters Thursday during a break in the proceedings.

Trump attorney Todd Blanche asked Judge Merchan is he could turn up the heat in the courtroom "just one degree," but the judge politely declined, saying he feared a one-degree bump in the nearly century-old building could increase the temperature by 30 degrees.

But the parties persevered, seating the jury's 12 members by the end of the day. Today they'll work to seat the jury's six alternates, in the hope of starting opening arguments on Monday.

Following court, Trump exited the courtroom where he reiterated to reporters that he spent the day in the courtroom instead of campaigning for president.

"I'm supposed to be in … New Hampshire … I'm supposed to be in Georgia. I'm supposed to be in North Carolina, South Carolina. I'm supposed to be in a lot of different places campaigning, but I've been here all day on a trial that really is a very unfair trial," he said.

The former president went on to claim that legal experts and various media outlets suggest there's no case.

"The case is ridiculous," he said. "It's missing fraud. There is no fraud."

A reporter, referring to a juror who had characterized Trump during questioning as "selfish and self-serving", shouted, "The juror called you selfish. How does that make you feel?" but Trump did not respond and exited the hallway.

-Kelsey Walsh and Michael Pappano

Judge Juan Merchan has recessed court for the day.

Proceedings will resume tomorrow with plans to choose the remaining alternates for the jury.

Prosecutors are keeping their cards close to vest regarding who the first witnesses called at trial will be.

When defense attorney Todd Blanche requested the names of the first three state witnesses, prosecutor Joshua Steinglass declined to provide the name of the first planned witnesses following opening statements.

“Mr. Trump has been tweeting about the witnesses,” Steinglass said. “We are not telling you who the witnesses are.”

Blanche attempted to ease that concern by vowing that the former president would not post about the likely witness.

“I don’t think you can make that representation,” Judge Juan Merchan said.

On a separate matter, Merchand said that if time permits tomorrow, he plans to hold a planned hearing on the bounds of Trump’s cross-examination if he opts to testify.