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 dramatic testimony, Hunter Biden's former romantic partner Hallie Biden described how, on the morning of Oct. 23, 2018, she went to go "clean out" Hunter Biden's car and found a gun.

"What did you find, in addition to trash and clothes?" prosecutor Leo Wise asked her.

"Remnants of crack cocaine and some paraphernalia," Hallie recounted. "Oh and the gun, obviously."

Hallie Biden said she found the firearm in "the arm console" of the car, which she said was not locked because "the lock had been broken." She said it was the first time she had ever seen a gun. She also found ammunition.

"I panicked, I wanted to get rid of them," she told the jury.

Asked why she panicked, Hallie Biden said she "didn't want him to hurt himself." She said she also worried about her kids finding the gun, saying she considered "hiding" it somewhere but was worried they would find it.

She said those frantic moments led to her throwing the gun in the trash. She told the jury she found a pouch to put it in -- which authorities say later tested positive for having cocaine on it -- and put the gun inside. The jurors were then shown the brown pouch she used.

"I was afraid to kind of touch it, I didn't know if it was loaded," Hallie Biden said, telling jurors she then put the pouch into another bag.

"I took it to the grocery store up the road and I threw it away," she testified.

At this point, jurors were shown surveillance video from the grocery store showing Hallie Biden throwing the gun into the trash.

In the video, her car is seen pulling into the parking lot; she then gets out of the driver's seated, opens the back door to get out the gun, then walks over to the store and places the bag in a garbage receptacle.

"Is that you Mrs. Biden?" prosecutor Leo Wise asked about her image on the video. "Yes," she replied.

Hunter Biden, sitting at the defense table, appeared to be locked on Hallie Biden the entire time, his head resting in his hand. He periodically covered his mouth.