President Biden on Friday signed an executive order that would require the review, declassification and release of classified government documents related to the terrorist attacks on Sept. 11, 2001.In doing so, Biden said he was fulfilling a promise he had made while campaigning for president, in which he had vowed, if elected, to direct the U.S. attorney general to “personally examine the merits of all cases” where the government had invoked state secrets privilege and “to err on the side of disclosure in cases where, as here, the events in question occurred two decades or longer ago.”