US President Joe Biden is doing fine after stumbling on the steps as he climbed aboard Air Force One on Friday, White House spokeswoman Karine Jean-Pierre told reporters. She suggested high winds at Joint Base Andrews near Washington may have been a factor. Boarding a flight to Atlanta, where he was to speak to the Asian-American community about a shooting there this week, Biden stumbled slightly about halfway up the 25 or so stairs, recovered, then stumbled again and briefly went down on one knee, according to video footage. In late November, Biden suffered a hairline fracture in his right foot while playing with one of his dogs. At 78, Biden was the oldest person ever to assume the presidency when he entered the White House on Jan 20.