From NBC's Rich Gardella
A closed briefing about the Fort Hood shooting incident for staff members of the Senate Armed Services Committee, originally scheduled for later this afternoon, has been postponed, according to the Committee's Democratic majority staff.
A representative of Chairman Levin's office confirmed that the Committee postponed the briefing at the request of the Obama administration.
According to previous reports, U.S. Army Secretary John McHugh and Army Chief of Staff Gen. George Casey would have briefed staffers about the details of the Fort Hood incident.
The briefing would have been the third for Senate Armed Services Committee staff.