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.

Donald Trump's lawyer Todd Blanche, during the contempt hearing on the limited gag order in the case, defended the former president's comments by arguing that Trump was responding to political attacks.

"President Trump does in fact know what the gag order allows him to do and not allow him to do," Blanche said. "There is no dispute that President Trump is facing a barrage of political attacks from all sides."

According to Blanche, while the limited gag order prohibits statements about a witness' potential participation in a case, Trump is allowed to make comments in response to political attacks from potential witnesses like Michael Cohen and Stormy Daniels.

"They are talking about their very strong dislike of President Trump," Blanche said about a post related to former Daniels attorney Michael Avenatti's comments on Michael Cohen.

Judge Juan Merchan questioned Blanche about what exactly made Trump's response "political" in nature.

"You believe that everything Mr. Avenatti said does not relate to the trial, but the use of the word 'pardon' makes it political and in a sense authorizes your client to respond?" Merchan asked.

"It's everything. It can't just be a single word," Blanche responded.

"When your client is violating the gag, I expect more than one word," Merchan said.

Conroy asked Merchan to advise Trump that for future violations of the gag order, "incarceration is an option should it be necessary."