how to watch the US presidential debate live on the BBC catch the live s cast of the presidential debate featuring carela Harris and Donald Trump tune in for full program coverage including analysis and reactions from experts and viewers the debate runs from 1:00 a.m. to 5 a.m. BSD providing a comprehensive viewing experience access the broadcast on BBC News Channel bbc1 and the BBC News website or app join us for this pivotal moment in US politics streamed live for UK audiences don't miss the action watch live and stay informed