And he was either fired or quit from that panel after missing two official meetings.
Here's what we know.
Giuliani was appointed to the panel in March 2006, then missed two two-day meetings. On the dates of those meetings, he was paid for lucrative speaking appearances elsewhere.
On April 11-12, 2006, the first official meeting of the Iraq Study Group was held in Washington, D.C. Where was Giuliani? On April 12, he was a keynote speaker at the FT Asian Financial Centers Summit in South Korea. His net fee: $160,000.
The second official meeting of the group was May 18-19, 2006. Where was Giuliani? On May 18, he spoke at the Georgia 100 annual awards breakfast in Atlanta. His net fee: $80,000. Later that day, he attended a $100-a-plate fundraiser for former Christian Coalition leader Ralph Reed, then a candidate for lieutenant governor of Georgia.
James Baker, secretary of state under the first President Bush, was co-chair of the Iraq Study Group, along with former U.S. Rep. Lee Hamilton, D-Ind. Baker declined to comment for this story.
But his co-chair explains how Giuliani left the group.
Hamilton says that after Giuliani told Baker he couldn't attend the second meeting in a row, "(Baker) said, 'I'm going to have to go to another person.' "
On May 31, 2006, the group announced former U.S. Attorney General Edwin Meese III would replace Giuliani.
At the time, Giuliani said: "My previous time commitments do not permit me the full and active participation that the Iraq Study Group deserves."
It's unclear whether he was fired or forced to quit, but consider this: During his two-month tenure on the panel, between March 15, 2006, and May 24, 2006, Giuliani made 30 paid appearances for a net revenue of $2.25-million, according to his financial disclosure forms.
Pretty simple to us; McCain's attack is True.