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What are some mass destruction weapons in Iraq?
The common justification is having weapons of mass destruction. Iraq was accused of having nuclear weapons that proved later to not true. Syria was accused of using chemical weapons against Syrian people although the inspection team have not yet proved whether the chemical weapons used by the government or by the opposition.
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".
None.
The U.S. believed that Iraq possessed weapons of mass destruction
WMD's are Weapons of Mass Destruction.
Iraq
The war in Iraq.