Article continues below advertisementDementia concerns surrounding Donald Trump have erupted as the president continues to explain the difference between sea and see.The president's rumored cognitive decline sparked a social media frenzy after the 79-year-old leader gave a rambling vocabulary lesson in the middle of discussing drug problems in the United States.Trump's senseless rant occurred at the White House on Tuesday, May 12, as he hosted law enforcement officials for a dinner in the Rose Garden in celebration of National Police Week.