National Archives considering asking past presidents and vice presidents to look again for classified materials

President Barack Obama (center) speaks as former Presidents Bill Clinton (left) and George W. Bush (right) listen in the Rose Garden at the White House in January of 2010.

The National Archives is looking into sending letters to all living former presidents and vice presidents, asking them go through their records to ensure there are no classified materials, according to sources familiar with the matter.

Representatives for four former presidents have all so far told CNN they do not have any classified records in their possession after news that former Vice President Mike Pence had classified documents in his Indiana home. The representatives for former Presidents Bill Clinton, George W. Bush, Barack Obama and the late George H.W. Bush all told CNN that all classified records had been turned over to the National Archives upon leaving office.