Donald Rumsfeld Seems to Think So

The basis of the invasion of Iraq was that Saddam Hussein posed an immediate threat to the United States because of his possession of WMDs. Now, Defense Secretary Donald Rumsfeld has stated that a reason that no WMDs have been found is because Hussein may have destroyed all of the WMDs prior to the war. If he destroyed the WMDs prior to the war and the U.S. knew he had WMDs prior to the war, then why didn’t the U.S. know that he destroyed the WMDs? Or did the current administration know this, but just neglected to pass that along to the American people?