"Biden's Memory Under Fire: Age and Mental Fitness Dominate Campaign Trail"

Mental ability and age of U.S. presidential candidates in focus.

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Trump accuses Biden and Haley of lacking mental capacity.

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Haley calls Trump mentally deficient; says Biden is too old.

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Biden White House attacks Trump's age and mental acuity.

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Biden, 81, and Trump, 77, are the two oldest elected presidents.

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Polls show concerns about Biden and Trump's age.

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Haley calls for mental competency tests for candidates over 75.

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Special Counsel report suggests Biden has a poor memory.

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Trump criticizes Biden's fitness for the commander-in-chief role; Haley calls Biden "diminished."

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