None.
What are some mass destruction weapons in Iraq?
There were allegations that Iraq had weapons of mass destruction and considering that Iraq famously used weapons of mass destruction during the Iran-Iraq War, such an allegation was not preposterous.
By claiming Iraq had weapons of mass destruction, making it a threat to national security
There is no definitive answer to this - only theories. There was the claim that Iraq was building weapons of mass destruction. The Bush administration later abandoned that claim, and didn't offer anything in its place.
Weapons of mass destruction
The United States of America, and her allies, blundered into a war in a Iraq, thinking that Saddam Hussein had "weapons of mass destruction" (for example nuclear, biological, chemical weapons), when it fact Iraq did not have "weapons of mass destruction".
The U.S. believed that Iraq possessed weapons of mass destruction
WMD's are Weapons of Mass Destruction.
Iraq
The war in Iraq.
He thought they were hiding Nuclear Weapons, A.K.A "Mass weapons of destruction."
Continuously allow UN weapons inspectors to make sure that Iraq was not trying to create weapons of mass destruction.