No more 20 second soundbites. Hillary Clinton and Donald Trump will have to explain themselves fully in their first face-to-face U.S. election debate tonight. The most recent poll gives Clinton a slight lead among voters – 46% to 44%. Another poll suggests 74 per cent of Americans will be watching the debate tonight, but 8 in 10 say it won’t change their vote. The debate begins at 9pm and will be broadcast on all major American TV networks.