President Joe Biden has not seen a neurologist outside his annual physicals, White House physician Kevin O’Connor said in a letter released Monday night addressing visits to the White House by a Parkinson’s disease expert. The visits by the expert, Dr. Kevin Cannard, had raised questions that White House press secretary Karine Jean-Pierre had left largely unanswered earlier in the day. Biden has been on the defensive trying to reassure Americans and Democratic lawmakers that he can...