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Biden dismisses Trump's attacks on his mental fitness: 'Watch me'

Democratic presidential nominee Joe BidenJoe BidenHillary Clinton responds to Chrissy Teigen tweet: 'I love you back' Supreme Court rejects Trump effort to shorten North Carolina mail-ballot deadline Overnight Defense: Trump campaign's use of military helicopter raises ethics concerns | Air Force jets intercept aircraft over Trump rally | Senators introduce bill to expand visa screenings MORE dismissed President TrumpDonald John TrumpHillary Clinton responds to Chrissy Teigen tweet: 'I love you back' Police called after Florida moms refuse to wear face masks at school board meeting about mask policy Supreme Court rejects Trump effort to shorten North Carolina mail-ballot deadline MORE’s attacks on his mental fitness during an interview aired Sunday evening. 

“Watch me, Mr. President,” Biden said in an interview with ABC News when asked about the president's attacks on the Democrat’s cognitive ability. 

“Watch me. Look at us both, what we say, what we do, what we control, what we know, what kind of shape we’re in,” Biden added. 

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Biden, 77, said he thinks it is a “legitimate question” to ask about mental fitness for any candidate over 70 years old. If elected, Biden would be the oldest U.S. president. Trump, now 74, was the oldest president to assume office to date. 

“The only thing I can say to the American people ... watch me,” Biden said. 

Sen. Kamala HarrisKamala HarrisTrump fights for battleground Arizona Biden to air 90-minute radio programs targeting Black voters The Hill's Campaign Report: Biden's big battleground | Trump and Harris hit the trail in Arizona | Turnout surges among new voters MORE (D-Calif.), Biden’s running mate, similarly dismissed Trump’s attacks leveled at her, calling them “distractions.”

“I really think that there is so much about what comes out of Donald Trump’s mouth that is designed to be a distraction to the American people that he is doing every day,” she said. 

Biden jumped in to say that “no president has ever” used the words Trump has to attack Harris.