Donald Trump's spy chief has locked a potentially explosive whistleblower complaint against her away in a safe as she battles with lawyers about sharing its details with Congress. The exact contents of the complaint against Director of National Intelligence Tulsi Gabbard are mired in secrecy but described as possibly posing "grave damage to national security" if disclosed, The Wall Street Journal reported Monday. Filed by an unidentified intelligence official, the complaint against Gabbard also includes a separate allegation involving another federal agency and potential claims of executive privilege concerning the White House.