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?"

On the eve of trial, U.S. District Judge Maryellen Noreika threw a wrench in one of the key arguments attorneys for Hunter Biden were planning to advance, ruling that an annotated copy of the federal form Hunter Biden is accused of lying on would be excluded from evidence.

The original document, called an ATF Form 4473, was created in 2018 when Hunter Biden purchased the firearm. But in 2021, gun store employees made a copy that included some handwritten notes. Defense attorney Abbe Lowell contended that employees had "tampered with" the document, and that it raised questions about "who wrote what on the form, and when."

Lowell hoped his argument would undermine the credibility of some key government witnesses -- the people who sold Biden the gun -- and potentially create a reasonable doubt that Hunter Biden was the one who actually checked that box.

Attorneys for special counsel David Weiss' office have said the gun shop employees merely "annotated" the form and urged Noreika to prevent Lowell from introducing it into evidence.

Late Sunday, Noreika sided with Weiss.

Jury selection is scheduled to get underway today in the federal gun trial of Hunter Biden, who authorities say broke the law when he purchased a Colt revolver in 2018.

President Joe Biden's son faces two counts of making false statements while purchasing the firearm and a third count of illegally obtaining it while addicted to drugs.

Although the charges together carry a possible sentence of up to 25 years, legal experts say that, as a first-time and nonviolent offender, Hunter Biden would not likely serve time if convicted.

The trial, in Delaware federal court, is expected to last two to three weeks.

Hunter Biden's attorney, Abbe Lowell, questioned FBI Special Agent Erika Jensen about Hunter Biden's infamous laptop, which prosecutors entered into evidence yesterday, asking her on cross-examination if she had done an "analysis" of whether "data" or "content" of the laptop was "tampered with, added to, or subtracted" during the months that passed between when Hunter Biden dropped off the device for service in April of 2019 and when the FBI obtained it in December 2019.

Jensen said she had not.

Lowell also took aim at the numerous text messages prosecutors have presented as evidence of Hunter Biden's drug addiction in 2018 and 2019.

Lowell showed that only two messages among the several alluding to drug use, drug paraphernalia, and drug purchases occurred during October of 2018 -- the period during which Hunter Bidden procured the firearm. The rest were either other months before the incident or months afterward, Lowell showed.

"You don't see any references … to baby powder?" Lowell asked Jensen, before ticking through other drug terms that appeared in the messages earlier in 2018 or later in 2019, including "chore boy" and "party favors."

Each time, Jensen replied "No."

Lowell also questioned Jensen about two messages Hunter Biden sent around the time of his gun purchase that did allude to drug use, one of them referring to an alleged drug dealer named "Mookie" and other referencing "smoking crack on a car" in Wilmington. Lowell sought to establish that Jensen had no firsthand knowledge about the contents of the messages.

"Do you know if there is a person named Mookie?" Lowell asked.

"No," Jensen replied.

"Do you know if he was on a car smoking crack?" Lowell asked later, referring to Hunter Biden.

"No," Jensen said.

Lowell subsequently ended his cross-examination of Jensen, and prosecutors undertook their redirect examination.