The claims about weapons of mass destruction (WMD) in Iraq primarily revolved around the belief that the Iraqi government, led by Saddam Hussein, possessed chemical, biological, and potentially nuclear weapons. Here are the main points regarding these claims:

1. Chemical Weapons: U.S. intelligence reports indicated that Iraq had stockpiles of chemical weapons, including nerve agents like sarin and mustard gas. These claims were based on Iraq's previous use of chemical weapons during the Iran-Iraq War and against Kurdish populations in the late 1980s.

2. Biological Weapons: There were assertions that Iraq had developed biological weapons, including anthrax and botulinum toxin. The U.S. government cited Iraq's past biological weapons program and its failure to fully disclose its capabilities to international inspectors.

3. Nuclear Weapons: Although the evidence was less concrete, there were concerns that Iraq was attempting to reconstitute its nuclear weapons program. This was based on reports of attempts to acquire uranium and other materials necessary for nuclear development.

4. UN Inspections: The United Nations Special Commission (UNSCOM) had conducted inspections in Iraq after the Gulf War, but the Iraqi government was often accused of obstructing these efforts. The U.S. and its allies argued that Iraq was not complying with UN resolutions requiring it to disarm.

5. Political Justifications: The claims about WMDs were a significant part of the justification for the 2003 invasion of Iraq. U.S. officials, including President George W. Bush and Secretary of State Colin Powell, emphasized the threat posed by Iraq's alleged WMDs to justify military action.

6. Post-Invasion Findings: After the invasion, extensive searches by the Iraq Survey Group found no stockpiles of WMDs. The failure to find these weapons led to significant controversy and debate regarding the intelligence used to justify the war, with many arguing that it was exaggerated or misrepresented.

These claims and the subsequent failure to find WMDs have had lasting implications for U.S. foreign policy and public trust in government intelligence assessments.