BETHESDA, Md. - President Joe Biden briefly transferred power to Vice President Kamala Harris on Friday while he underwent a routine colonoscopy, setting up a history-making moment as Harris became the first woman to hold that authority during the short time she stepped in as acting president.President Joe Biden, 78, the oldest person to serve as president, transferred power to Harris, the first woman, person of color and person of South Asian descent to be vice president, for one hour and 25 minutes, while he was under anesthesia at Walter Reed National Military Medical Center.