evidence: - An independent lawyer, or special counsel, will investigate whether President Joe Biden mishandled classified files, Attorney General Merrick Garland said - His announcement came after the White House said a second set of classified documents had been found by Biden's lawyers at his home in Wilmington, Delaware - Similar documents were discovered in November by aides at a Washington DC office Biden used after his term as vice-president - The president told reporters he takes "classified material seriously" while the White House said the files were "inadvertently misplaced".