INDIANOLA, Iowa – Joe Biden has called for Bernie Sanders’ presidential campaign to “disown” what he calls “doctored video” that some Sanders supporters say shows the former vice president endorsing Republican calls to cut Social Security and Medicare. “There’s a little doctored video going around ... put out by one of Bernie’s people,” Biden told supporters Saturday in Indianola, Iowa, referring to a 2018 speech in which Biden discussed then-House Speaker Paul Ryan saying rising deficit demanded action on the popular entitlement programs. “I’m looking for his campaign to come forward and disown it,” Biden continued, pointing to his 2020 campaign proposals designed to shore up Social Security.