MAKE SURE TO WATCH THE VIDEO. - President Joe Biden was caught on camera in an uncomfortable exchange with a reporter on Saturday - The president had to pull out notes to answer a question at a cherry shop in Michigan about the latest cyberattack thought to be from Russians - 'We're not sure it's the Russians. I got a brief when I was on the plane. That's why I was late getting off the plane,' he said before fumbling with pieces of paper - Biden tried to speak with reporters while also checking out with the cashier - Interaction comes as Rep. Ronny Jackson, Trump's former top White House doctor, demands Biden take test measuring cognitive fitness - Trump took Montreal Cognitive Assessment administered by Jackson in 2018 - Biden's cognitive state has been questioned in light of a series of verbal gaffes throughout his campaign and presidency