President Biden made a surprise visit to the home of Hallie Biden late Sunday, days before she is scheduled to testify as a critical witness for the prosecution in Hunter Biden’s federal gun trial, which starts next week.

Mr. Biden visited Hallie Biden’s Delaware home around 8 p.m. for a brief chat, ahead of Hunter Biden’s gun trial, which begins June 3 in Wilmington, Delaware. The White House did not provide any details about the visit.

Hallie Biden is the ex-wife of Beau Biden and she dated Hunter Biden at the time of his alleged gun crime. Beau Biden died this week in 2015.

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Hunter Biden has pleaded not guilty to three federal charges of purchasing a gun while using illegal narcotics, including allegations of falsely submitting a form saying he was not using drugs when he bought a revolver in 2018.

Prosecutors say Hunter Biden illegally possessed the weapon, which Hallie Biden disposed of in a public dumpster in 2018.

Hallie Biden has been described as “witness 3” in court documents and identified as being “in a romantic relationship with the defendant in October 2018” and he “stayed at her home in the fall of 2018” — which coincides with the time that Hunter Biden was living with Hallie Biden.

In addition to Hallie Biden, Hunter Biden’s ex-wife Kathleen Buhle and ex-girlfriend Zoe Kestan will also testify. If convicted, he faces up to 25 years in prison.

The trial is expected to last about two weeks.

In a separate case, Hunter Biden faces federal tax charges. That case is set to go to trial June 20 in California. He has pleaded not guilty to those charges.