US election 2016: Battlegrounds targeted as polls tighten @bbc.com

Donald Trump and Hillary Clinton have made renewed attacks on each other's fitness for office as polls suggest the race for the Whit...

Donald Trump and Hillary Clinton have made renewed attacks on each other's fitness for office as polls suggest the race for the White House is tightening.

Mrs Clinton - who has seen her national opinion poll lead shrink in recent days - targeted her Republican rival's temperament and attitude to women.

Mr Trump said she would be followed into the White House by criminal investigations.

He has gained ground on Mrs Clinton in some swing states, polls suggest.

Thursday's campaigning included a rare appearance by Mr Trump's wife Melania.

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