Sept 11 panel invites Cheney to show proof

He said the panel also wants to follow up its questioning of President Bush's national security adviser, Condoleezza Rice, and CIA Director George Tenet.

The Cheney request culminates a week in which the commission said it found no evidence of collaboration between Saddam's Iraq and al-Qaeda, while the White House stuck by its position that the two had significant links.

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Cheney told the CNBC network that there probably were things about Iraq's links to terrorists that the commission members did not learn during their 14-month investigation.