'I got sandbagged' - Biden jokes after tripping over

STORY: The 80-year-old U.S. president fell forward, caught himself with his hands, then got up on one knee helped by three people. He walked back to his seat unassisted.

After Biden was helped up, he pointed behind him, seeming to indicate what he tripped over. He mingled with other officials afterward, smiling and giving a "thumbs up" sign.

White House communications director Ben LaBolt said on Twitter that Biden was fine. "There was a sandbag on stage while he was shaking hands," he explained.