08:06NewsdayUS Democrats hold TV debate in bid for the White HouseBBC World Service Duration: 23 minutes Wed 31st Jul 2019, 08:06 on BBC World Service West and Central AfricaAvailable for over a yearListen nowThe candidates debated some of the key policies for the 2020 race. Show more GenresNewsFormatsMagazines & ReviewsBrandNewsday Source: BBC Online