This is pretty much common knowledge at this point, but it is a tale still worth telling. Before Bush’s Iraq war, a Vatican delegation led (I believe) by Cardinal Pio Laghi came to America to try and dissuade the administration from invading and occupying Iraq. They made two main points. First, there was no way the just war theory applied, especially as the threat was not imminent. Second, the Vatican’s sources stated that Saddam Hussein possessed no weapons of mass destruction, and they were pretty confident that this was the truth.
(This information comes from an impeccable source, who spoke to somebody on the Vatican delegation who was in the room at the time.)