A look at the key witnesses in Hunter Biden's federal firearms trial

Jurors who will decide whether President Joe Biden's son is guilty of federal firearms charges are hearing deeply personal testimony about a dark period for Hunter Biden.

The case playing out in the federal court in Wilmington, Delaware, stems from a gun the younger Biden bought in October 2018, months before his father announced his bid for the presidency.

Prosecutors say Hunter Biden lied when he swore he wasn't a drug user on a federal form he filled out at the gun shop. He had the gun for about 11 days before it was thrown in a trash can.

Hunter Biden’s attorney argues his client did not believe he was in the throes of addiction when he stated in the paperwork that he did not have a drug problem.

Hunter Biden was supposed to have avoided prosecution in the gun case altogether, but a deal with prosecutors fell apart last year. He was subsequently indicted on three felony gun charges. He also faces a trial scheduled for September on felony charges alleging he failed to pay at least $1.4 million in taxes over four years.

Here's a look at some key witnesses in the trial:

KATHLEEN BUHLE

One of the prosecutors' first witnesses was Hunter Biden's ex-wife, who filed for divorce in 2016 after more than 20 years of marriage. They have three children together. In divorce proceedings, she accused him of squandering their money on drugs, alcohol, strip clubs and prostitutes.

On the witness stand, Buhle described learning about Hunter Biden's drug use when she found a pipe used to smoke crack cocaine in an ashtray on their porch in July 2015, weeks after Hunter's brother Beau died from brain cancer.

When she confronted Hunter, he «acknowledged smoking crack,” she told jurors.

Buhle testified that she suspected that Hunter