White House releases letter from Biden’s doctor after questions about Parkinson’s specialist’s White House visits CBS NewsBiden lashes out at Trump, Supreme Court as more Democrats say he should withdraw Fox NewsParkinson’s Expert Visited the White House Eight Times in Eight Months The New York TimesParkinson’s expert visited White House 8 times in 8 months, met with Biden’s doctor ABC NewsWhite House admits Parkinson’s expert has examined Biden – but says only for his annual physicals New York Post