Joe Biden makes his first public comments since he struggled in the debate on Thursday

Directly addressing concerns about his age and saying "when you get knocked down, you get back up"

Democrats have expressed unease at the president's shaky debate performance  

With party insiders saying some of his answers triggered panic

Biden's campaign insists the president will not step down as the Democratic candidate

That he will debate Donald Trump again in September

At a campaign rally in Virginia, Trump told the crowd the debate was a "big victory" for him

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Said he does not think Biden will bow out of the race