File photo taken on June 27, 2019 shows Senator Kamala Harris of California being interviewed after the second night of the first Democratic primary debate in Miami, Florida, the United States. (Xinhua/Liu Jie)

WASHINGTON, Aug. 19 (Xinhua) -- U.S. senator from California Kamala Harris, who was chosen by Democratic presidential nominee Joe Biden to be his running mate in the 2020 presidential election, delivered a speech Wednesday to formally accept her nomination as the party's vice presidential candidate.