Candidates greet each other before the start of the second night of the second U.S. 2020 presidential...
Former Vice President Joe Biden look on as U.S. Senator Cory Booker and U.S. Senator Kamala Harris greet each other before the start of the second night of the second U.S. 2020 presidential Democratic candidates debate in Detroit, Michigan, U.S., July 31, 2019. REUTERS/Lucas Jackson