Air Force One was en route to the World Economic Forum in Davos when the lights in the press cabin briefly went dark, a reporter said, per The Associated Press. A half-hour into the journey, the press was told the flight would be returning to Joint Base Andrews. The president later took a smaller version of Air Force One to Switzerland.

The flyover formation will incorporate aircraft from the two branches to symbolize the country’s independence and journey.

Air Force One experienced a “minor electrical issue” and was forced to return to Maryland Tuesday night shortly after President Trump took off for Switzerland, the White House said.

Air Force One turned around while en route to the World Economic Forum (WEF) in Davos, Switzerland Tuesday night. The crew reportedly detected a “minor electrical issue” and decided to return to Andrews Air Force Base “out of an abundance of caution,

Trump boarded another aircraft and continued on with his trip to the World Economic Forum in Davos shortly after midnight.