Former Defense Secretary Robert Gates said in an interview that aired Sunday the he didn't know if his former colleague, Joe Biden, could make an effective president.
Gates, who served in both the Obama and Bush administrations, has previously said Biden has "been wrong on nearly every foreign policy and national security issue for the past four decades."
Gates also said it was "problematic" to have a president in their 70s. Biden is 75, Sen. Bernie Sanders is 77, and President Donald Trump is...
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