From the official White House blog.  Google is your friend:

Yes, Google is your friend:

Obama stonewalls release of White House visitor logs

Justice Department lawyers also repeated the blanket argument that to release these records could compromise national security and praised the Obama administration's efforts to "voluntarily" release some White House visitor logs to the public. (In 2009, the Obama White House began to release, in order to settle related litigation, a select number of Secret Service visitor logs to the public. However, tens of thousands of other records continue to be withheld in defiance of FOIA law.)

The Obama White House admits in the new court filing that it is taking records from the Secret Service in order to ensure that they are not disclosed under FOIA. The Obama administration speculates that there would be "dire national security consequences" if certain White House visitors are disclosed. The Obama White House wants to be able to withhold visitor logs until as long as 12 years after President Obama leaves office.

http://www.examiner.com/l...white-house-visitor-logs