Nope. You're reading fake news. To begin with, numerous foreign intelligence agencies also believed that Iraq had an active WMD program. The intelligence agencies of Germany, Israel, Russia, Britain, China and France all believed Saddam had WMDs. CIA Director George Tenet also rather famously said that it was a “slam dunk” that there were weapons of mass destruction in Iraq.
Many Democrats who had access to the same flawed CIA "intelligence" came to the same conclusion and said so publicly. Bill Clinton, Hillary Clinton, Al Gore, John Kerry, John Edwards, Robert Byrd, Tom Daschle, Nancy Pelosi and Bernie Sanders all publicly promoted the idea that Iraq had WMDs. Some of them, like Hillary Clinton, even alleged that Saddam was working on nuclear weapons.
“In the four years since the inspectors left (how can the IAEA know anything at all if they're not even there?), intelligence reports show that Saddam Hussein has worked to rebuild his chemical and biological weapons stock, his missile delivery capability, and his nuclear program. He has also given aid, comfort, and sanctuary to terrorists, including Al Qaeda members, though there is apparently no evidence of his involvement in the terrible events of September 11, 2001. It is clear, however, that if left unchecked, Saddam Hussein will continue to increase his capacity to wage biological and chemical warfare, and will keep trying to develop nuclear weapons. Should he succeed in that endeavor, he could alter the political and security landscape of the Middle East, which as we know all too well affects American security.” — Hillary Clinton, October 10, 2002
The IAEA had no idea what he had because they were thwarted at every turn from conducting inspections ... and they just left.
If you'd like links, I have several dozen. It's a really easy Google search.