President Joe Biden’s son Hunter Biden was convicted by a jury on Tuesday of lying about his drug use to illegally buy a gun.

A 12-member jury in Wilmington, Delaware, federal court found him guilty on all three counts against him, making Hunter Biden the first child of a sitting US president to be convicted of a crime.

Hunter Biden, 54, lightly nodded his head after the verdict was read but otherwise showed little reaction. He then patted his lawyer Abbe Lowell on the back and hugged another member of his legal team.

The judge set no date for sentencing, but added the timeline is usually within 120 days. That would place it no later than a month before the November 5 US presidential election.

Sentencing guidelines for the gun charges are 15 to 21 months, but legal experts say defendants in similar cases often get shorter sentences and are less likely to be incarcerated if they abide by the terms of their pretrial release.

The trial followed the May 30 criminal conviction of Donald Trump, the first former US president to be found guilty of a felony and the Republican challenger to Joe Biden, a Democrat, in the November 5 election.

Trump, convicted on 34 felony counts of falsifying business records to cover up a sex scandal, accuses Democrats of pursuing that case and three other criminal prosecutions to prevent him from regaining power in his rematch with Joe Biden.

Congressional Democrats have pointed to cases including the Hunter Biden prosecution as evidence that Joe Biden is not using the justice system for political or personal ends, having said last week he would not pardon his son if convicted.

The Hunter Biden case was brought by US Department of Justice Special Counsel David Weiss, a Trump appointee.

Weiss has also charged Hunter Biden with three felony and six misdemeanour tax offences in California, alleging he failed to pay US$1.4 million in taxes between 2016 and 2019 while spending millions on drugs, escorts, exotic cars and other high-ticket items.

Hunter Biden has pleaded not guilty to those charges. A trial is scheduled for September 5 in Los Angeles. (Reuters)