First son Hunter Biden returned to Washington, DC, on Tuesday following a Fourth of July weekend getaway to Camp David with his father and other members of the Biden family — during which a powdered substance found in the West Wing initially tested positive for cocaine.

President Biden, first lady Jill Biden, Hunter, his wife Melissa Cohen, their son Beau Jr. and Hunter Biden’s daughter Finnegan were all spotted disembarking Marine One at Fort McNair in Washington on Tuesday morning. 

The White House pool report noted that Beau Biden Jr., “seemed reluctant” to get into one of the vehicles in the president’s motorcade that took the family back to the White House. 

The 80-year-old president and his wife hosted a barbecue for active-duty military families on the White House lawn Tuesday evening ahead of a nighttime fireworks spectacular over the National Mall.

The president and his family returned to the White House about 36 hours after an “unknown item” found Sunday night forced a brief evacuation of the building and drew a Hazmat team to the executive mansion. 

The white powdery substance, found in a holding area accessible to both White House staffers and guests, tested positive for cocaine, officials familiar with the matter told The Post. Further tests were planned to confirm the nature of the substance.

Authorities are now trying to determine how the substance got into the White House. 

Hunter Biden, 53, who has acknowledged a prior addiction to crack cocaine, was on the White House grounds Friday before heading off to Camp David with his father for the second weekend in a row.