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US President Donald Trump on Wednesday ordered an investigation into what Republicans claim was a “conspiracy” to cover up Joe Biden’s declining cognitive health during his time in the White House.

The move, which was slammed by Biden, is the latest in a long-running campaign by Trump — with the backing of Republican Party politicians and their cheerleaders in the conservative media — to discredit his predecessor.

But it also comes as a growing chorus of Democrats begin to acknowledge the former president appeared to have been slipping in recent years.

Those concerns were thrown into stark relief by a disastrous debate performance against Trump during last year’s presidential campaign, in which the then-81-year-old stumbled over his words and repeatedly lost his train of thought.