White House aides covered up President Biden’s apparent mental decline from Day 1 of his presidency, shielding the aging commander-in-chief from the public and even rearranging his schedule after scatterbrained performances, an explosive report revealed Thursday. The lack of access to the nation’s oldest-ever president has been well known in Washington — with Biden hosting the fewest large press conferences in modern history and frequently descending into gaffes at the podium when he appeared — but how much the White House made up for the haziness had until now been hidden, according to aides, Democratic lawmakers and donors who spoke...