Looking back on the Iraq war after 20 years (and 1 month); lingering uncertainty about the reasons for the US invasion; the role (or lack thereof) of groupthink in that decision; the intelligence community’s judgment that Iraq had WMD and was reconstituting its nuclear weapons program; why the intelligence community got it wrong; lessons learned for intelligence analysis; the long-term repercussions of the Iraq war; and Marcus puts his cards on the table