Report calls for Obama to name US nuclear adviser

US President-elect Barack Obama has a historic opportunity to drastically reduce the threat of nuclear terrorism and should appoint a senior White House official to take charge of countering the danger, according to a report released Tuesday. Despite progress on improved security, major gaps remain, said the report prepared by Matthew Bunn, associate professor of public policy at Harvard University's Kennedy School of Government. The world still faces a "very real" risk that terrorists could get a nuclear bomb and the incoming president must make reducing the threat a top priority of US security and diplomacy, the report said. "Despite all the challenges he faces, President-elect Obama cannot afford to let this sit on a back-burner," Bunn said in a telephone interview.