US President Joe Biden at Chicago International Airport. File photoWASHINGTON, Jun 8 US President Joe Biden stumbled again while climbing the plane. Biden traveled from Washington to Los Angeles on Wednesday to attend the US-sponsored Summit of the Americas. The footage distributed by American television channels shows how the US President takes several steps along the gangway, and then stumbles, but, holding on to the handrail, remains on his feet. In March last year, the US President stumbled three times while boarding his plane. The White House then attributed the hitch on the gangway to strong winds and assured that the president was feeling great.