Bethesda — Donald Trump’s struggling US presidential campaign is increasingly pinning his re-election on the claim that Joe Biden is mentally unfit for the job — and is looking towards the presidential debates as an opportunity to goad the 78-year-old Democrat nominee into a gaffe that will sink his rising poll numbers.

Biden is enjoying front-runner status but has accomplished that largely with a highly scripted campaign. Though the coronavirus pandemic has ended the informal glad-handing with voters and parrying with reporters that Biden relishes, it has also protected him from his own famously runaway tongue. The Trump campaign says more debates will put Biden’s age on display...

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