Bernstein says sources suggest concerns about Biden have been growing for a year CNNSources close to Biden report ‘marked incidence of cognitive decline’ in last 6 months: Bernstein Fox NewsJoe Biden Has Suffered ‘Cognitive Decline’ in Past Six Months: Report NewsweekWatergate Reporter Carl Bernstein: Biden Has ‘Bad Days’ The Daily BeastOpinion: What went wrong for Joe Biden? A neuropsychologist’s verdict The Irish Times