US President Joe Biden quipped that he got "sandbagged" after he tripped and fell -- but was uninjured -- while on stage at a US Air Force Academy graduation.
Biden had been greeting graduates in Colorado Springs, Colorado, at the front of the stage with salutes and handshakes, and turned to jog back toward his seat when he fell on Thursday.
He was helped up by an air force officer as well as two members of his US Secret Service detail.
Onlookers, including some members of the official delegation onstage, watched in concern before Biden, who at age 80 is the oldest president in US history, returned to his seat to view the end of the ceremony.
"I got sandbagged," the president told reporters with a smile when he arrived back at the White House on Thursday evening before pretending to jog into the residence. Two small black sandbags had been onstage supporting the teleprompter used by Biden and other speakers at the graduation.
"He's fine," White House communications director Ben LaBolt tweeted after the incident. "There was a sandbag on stage while he was shaking hands."
Biden has been dogged by questions about his age and his fitness to serve, and his missteps have become fodder for political rivals as he campaigns for a second term in 2024.
He has stumbled before going up the stairs and onto Air Force One and he once got caught up in his bike pedals while stopping to talk to reporters near his home.
Biden's personal doctor said after the president's most recent physical exam in February that Biden "remains a healthy, vigorous 80-year-old male, who is fit to successfully execute the duties of the Presidency".
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