The White House blamed a sandbag on the stage and said the president was finePresident Joe Biden laughed off his embarrassing fall at the Air Force Academy commencement ceremony as he arrived safely back at the White House on Thursday. But the stumble marks the fourth time Biden fell in public since taking office in January 2021. President Joe Biden is helped up after falling during the graduation ceremony at the United States Air Force Academy in Colorado. Biden also stumbled while boarding Air Force One in March on a trip to Selma, Alabama. He also acknowledged the Air Force Academy graduates who pilot Air Force One.