(Mark Humphrey | AP file photo) Former national security adviser John Bolton takes part in a discussion on global leadership at Vanderbilt University in Nashville, Tenn., on Feb. 19, 2020. An attorney for Bolton said Wednesday, June 10, that President Donald Trump is trying to put on ice publication of the former top administration official’s forthcoming memoir after White House lawyers again this week raised concerns that the book contains classified material that presents a national security threat.