The US Justice Department is considering dropping its case against two former pro-Israel lobbyists accused of illegally disclosing national defense secrets, government officials said Tuesday. Steven J. Rosen and Keith Weissman were charged in 2005 with conspiring to obtain classified documents and sharing them with reporters and former diplomats. Like other cases centered on espionage and classified information, a critical issue in pretrial hearings has been how much of the government's case must be aired in open court. Trial has been postponed at least nine times as the defense and prosecutors wrangled over the handling of classified information and other issues. The defendants won an appeals court victory on that front in February when a three-judge panel ruled that some classified evidence could be presented at trial.