Former President Trump has arrived at the courthouse in lower Manhattan.

He stepped out of his motorcade, waved, and walked into the side entrance.

A small group of supporters and protesters both cheered and booed his arrival.

Former President Trump is en route to the courthouse in lower Manhattan for this morning's proceedings.

The former president left for the the courthouse from Trump Tower in Midtown Manhattan.

Court this morning may start with a hearing over what prosecutors can ask Trump during cross-examination should he take the stand later in the trial.

The judge would hear arguments from both the people and the defense. The proceedings would then move into jury selection later in the morning.

Prosecutors have indicated they would want to cross-examine Trump on approximately "thirteen different court determinations," including the recent civil finding that he sexually abused columnist E. Jean Carroll, the criminal conviction of the Trump Organization last year, the finding that he committed a decade of business fraud, and the dissolution of his charity, according to sources familiar with the matter.

The hearing -- known as a Sandoval hearing -- is standard practice before jury selection and typically occurs when a defendant signals a willingness to testify.

In a filing last month, Trump's lawyers requested a Sandoval hearing to limit the scope of Trump's potential cross examination, if he opted to testify.

ABC News' Katherine Faulders contributed to this report.

Former President Trump will leave his Trump Tower apartment in Midtown Manhattan this morning and travel down to lower Manhattan for the first day of jury selection in his criminal hush money trial.

The proceedings come after Trump unsuccessfully tried three times last week to delay the start of the trial through the filing of appeals.

As a defendant in a criminal case, the former president will be required to be in court for the entire trial, which is expected to take six to eight weeks.

"Karen McDougal was a Playboy model," former National Enquirer publisher David Pecker said, recalling how he learned in June 2016 "that there's a Playboy model who is trying to sell a story about a relationship that she had with Donald Trump for a year."

Pecker said he immediately called Trump's then-attorney Michael Cohen to inform him. By then, he was speaking to Cohen "a couple times a week," but that soon changed. Pecker said he and Cohen spoke "much more frequently" about McDougal's claims.

"Michael was very agitated. It looked like he was getting a lot of pressure to get the answer right away," Pecker said. "He kept on calling, and each time he called he seemed more anxious."

Pecker said he assumed "Mr. Trump was asking Michael Cohen, 'Did we hear anything yet?'" Pecker said.

"Did you ever come to believe that Michael Cohen had spoken with Mr. Trump about McDougal's claims?" prosecutor Josh Steinglass asked.

"Yes I did," Pecker responded before recounting a phone conversation Pecker said he himself had with Trump.

"I said I think the story should be purchased and we should buy it," Pecker recalled telling Trump. "Mr. Trump said to me, 'I don't buy stories. Anytime you do anything like this, it always gets out.'"

Ultimately, McDougal was paid $150,000 and promised a series of exercise articles in the publication.

Following that testimony, court was adjourned.

It's expected the jury will hear more on McDougal upon Pecker's return to the witness stand, when court resumes on Thursday.