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.

Government prosecutors told jurors in the trial's opening statements that they should make "no distinction for Hunter Biden or anybody else" as they weigh the gun case against the president's son.

Hunter Biden "chose to lie," prosecutor Derek Hines said, laying out the case that the defendant purchased a gun while knowing he was an addict and drug user.

Hines said Hunter Biden bought the firearm from a gun seller who will testify as a witness that the younger Biden filled out form 4473 -- consenting to a federal background check -- and certified that he understood the form. The prosecution said it will show Hunter Biden "bought a gun and lied during a background check."

The man who sold Hunter Biden the gun will testify that he watched the defendant fill out the form.

The gun was then "taken by someone concerned he had a gun. That person was Halle Biden," Hines said, referring to Hunter Biden's romantic partner at the time.

Halle Biden disposed of the gun in a dumpster, where it was retrieved by a man who will also be a witness called by the government.

"The police were called" when Halle Biden went to retrieve the gun, Hines said.

Hines, in his opening, said evidence will show that "Hunter Biden knew he was a drug user and a drug addict" when he filled out the form.

Hines cited Hunter Biden's memoir, "Beautiful Things," in which he wrote he had a "superpower of buying crack anywhere, anytime."

In text messages presented by the prosecution, Hunter Biden acknowledged, "I am an addict."