The president made a Sunday evening visit to the Wilmington, Delaware, home of Hallie Biden, the widow of his elder son, Beau, and former girlfriend of Hunter, ahead of her expected testimony in the Delaware gun prosecution of his son. 

Ms. Biden was married to Beau for 13 years before his death in 2015, and had a relationship with her former brother-in-law betwen 2016 and 2019. She was dating Hunter when he was actively addicted to drugs in the wake of his brother’s death. She is also the one who found Mr. Biden’s gun, likely making her the prosecution’s key witness.