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?"

According to a transcript of Tuesday's proceedings released hours after court concluded, at attorney for Hunter Biden told the judge during a sidebar conversation that he might decide to call Hunter Biden's oldest daughter, Naomi Biden, to testify at trial "if need be."

Attorney Abbe Lowell made the statement during what appeared to be a tense exchange between him, Judge Maryellen Noreika and two government prosecutors, in which Lowell divulged his expectations for witnesses.

When prosecutors suggested Lowell was hiding the ball on how he planned to present certain evidence, Lowell first introduced the idea of calling one of Hunter Biden's daughters as a witness:

MR. HINES: Exactly, we have asked Mr. Lowell and he won't tell us.
MR. LOWELL: That's not what I said.
MR. HINES: He couldn't tell us which witness.
MR. LOWELL: I said I'm making a proffer and the court -- I understand the rules, each one of these will be submitted with a witness, I don't have to tell them in advance which witness it is, but I am making a statement to the Court, there is three or four witnesses, including his uncle and his daughter, if need be.

Lowell later clarified that Naomi Biden, Hunter Biden's daughter with ex-wife Kathleen Buhle, and the president's eldest granddaughter, was on his witness list.

Lowell also left the door open for Hunter Biden to testify "if it gets to that," a gamble that would put his client in the position of facing live cross-examination from federal prosecutors. It came during a discussion about how Lowell planned to demonstrate that Hunter Biden read the ATF Form 4473 "carefully."

THE COURT: Wait. Just so I'm clear, are you going to suggest that he did in fact read these things or just that if he had chosen to and didn't tell them.
MR. LOWELL: Both.
THE COURT: What is your evidence going to be that he did in fact read all of these things carefully?
MR. LOWELL: If it gets to that judge, then it will be Mr. Biden's job to say that.

During a debate at the same bench conference about an argument Lowell intended to make in his opening statement, Judge Maryellen Noreika called the defense attorney for interrupting her.

MR. LOWELL: That's not the argument judge.
THE COURT: That is what it sounds like you're telling me, you're saying he doesn't know what it was.
MR. LOWELL: No.
THE COURT: You keep cutting me off, and you want to make your argument, and I know you want to make your argument, but you need to understand it, so you need to understand where I am.

The judge later told Lowell, "Don't put words in my mouth."

"I know you're just trying to zealously represent your client," she said, "but don't assume my ruling before you give me a chance to make it."