I haven't read the book yet, but I recommend this review of Robert Draper's How the Bush Administration Took America Into Iraq by James North at Mondoweiss.
Indisputably, George W. Bush's invasion of Iraq in 2003, based on lies and cooked "intelligence," was the worst, most consequential foreign-policy move by an American president in recent history. The Middle East, the United States, and the rest of the world will suffer its effects for many years to come. This is not just a work of history, based on 300 interviews. North writes:
The Iraq tragedy is relevant today. On September 14, Donald Trump made up a new threat from Iran, and tweeted: “Any attack by Iran, in any form, against the United States will be met by an attack on Iran that will be 1,000 times greater in magnitude!” Trump sounds unhinged—until you recall that just this January, he provocatively ordered the assassination of Iran’s General Qasem Soleimani—and got little resistance from either the mainstream U.S. press or the foreign policy establishment. Cowardly group-think didn’t end with Iraq.