 President Biden, in a public letter to congressional Democrats, is standing firm against calls for him to drop his candidacy after his dismal debate performance. The White House facing a barrage of questions about the mental fitness of President Biden. There are reports that a Parkinson's disease specialist visited the White House eight times over an eight-month period. Press Secretary Karine Jean-Pierre would not give any details, citing privacy issues, although the health of the president not considered a privacy issue.