After filling out the jury questionnaire, the first panel of prospective jurors are being brought into the court room one-by-one to face individual questioning from the judge and both parties. As of about 9:45 a.m. ET, the court had made it through the questioning of just six jurors.

The prospective jurors so far have include a woman who worked with the Secret Service for over two decades and whose husband was a uniformed officer in Washington, D.C., at locations including the White House.

One prospective juror who volunteered for Hilary Clinton's 2008 campaign prompted the first mention of President Joe Biden -- though not by name.

Judge Norieka asked that prospective juror if her work volunteering and donating to Democratic campaigns would prevent her from being fair in a case that involved "the son of the Democratic president of the United States."

She said it would not.

The exchange occurred as first lady Jill Biden sat in the front row of the gallery, watching intently as each juror answered their questions. The first lady is sitting next to Hunter Biden's wife, Melissa.

Earlier, a prospective juror was struck for cause because of his firm views on guns, after he told the judge he thought gun ownership was a "God-given right." He said he would not be able to be impartial in a case where someone was prevented from buying a gun due to federal law.

Hunter Biden's arrival through the front entrance of the J. Caleb Boggs Federal Building this morning means he would have passed an enormous portrait of his father, which hangs in every federal courthouse in the country.

The first batch of 50 jurors were sworn in by Judge Noreika, who instructed them not to discuss the case with anyone, including family, or to conduct any research on the case or to read any news about it.

Reporters monitoring the proceedings from the overflow room could not hear most of Noreika's statement due to technical difficulties. As technicians tried to fix the issue, they turned on a TV that happened to be playing an attack ad against Joe Biden.

Hunter Biden has arrived at the courthouse for the start of his federal gun trial this morning.

His stepmother, first lady Jill Biden, is attending the proceedings.

Two hundred and fifty Delaware residents have been summoned to the courthouse in downtown Wilmington, where they will face typical questions about their fitness to serve as jurors.

But because this is the trial of the son of a sitting president, there will be some novel topics covered during the jury selection process known as "voir dire."

Among the questions jurors will be asked: "If you were eligible to vote in any election(s) in which Joseph R. Biden was a candidate, would that fact prevent you from maintaining an open, impartial mind until all of the evidence is presented, and the instructions of the Court are given?"

And "Do you believe Robert Hunter Biden is being prosecuted in this case because his father is the President of the United States and a candidate for President?"

In the first exhibits presented in the government's case, prosecutors played excerpts from the audiobook of Hunter Biden's 2021 memoir "Beautiful Things" -- in which jurors heard in his own words about some of the most personal low points of his yearslong addiction to crack cocaine.

FBI Special Agent Erika Jensen, the government's first witness, introduced about a dozen audio excerpts played out over an hour, as Hunter Biden's voice boomed over the courtroom's loudspeakers while his stepmother, first lady Jill Biden, and several other members of his family sat in attendance.

"I used my superpower of finding crack cocaine anytime, anywhere," Hunter Biden said of the year 2018 -- the same year he purchased the gun that prosecutors say he lied to get. The audio contained passages in which he spoke about the darkest and most dangerous moments of his addiction -- at one point doing cocaine in the bathroom while on a graduation trip with his daughter. .

Jill Biden and her daughter Ashley Biden sat shoulder-to-shoulder as the clips played out, at times leaning their heads against one another. At one point, as Hunter Biden's voice was heard describing a raucous 12-day bender in Los Angeles, Jill Biden lifted her left arm and draped it around Ashley's shoulders.

A person sitting with the family told ABC News they were both "fighting off tears."

Hunter Biden, for the most part, stared intently into the nearby monitor displaying the book's contents, at one point slightly nodding along as he reheard some of his most painful struggles. The jurors appeared largely engaged, with many taking notes and looking up at the screen to follow along.