You can go here to see a letter, dated March 18, 2003, on the White House web site itself, wherein George W. Bush tried to associate Iraq with 9/11.
Was Iraq:
an international terrorist?
a terrorist organization?
a nation [which] planned, authorized, committed, or aided the terrorist attacks that occurred on September 11, 2001?
an organization [which] planned, authorized, committed, or aided the terrorist attacks that occurred on September 11, 2001?
a person who planned, authorized, committed, or aided the terrorist attacks that occurred on September 11, 2001?
According to Bush's letter, one of these must be true in order to justify the war on Iraq. Since Bush has plainly admitted that Iraq had nothing to do with 9/11, we're only left with the first two possibilities. Iraq is either an international terrorist or a terrorist organization.