US public opinion on the war, supportive at first, has soured, contributing to a dive in Bush's popularity.
The conflict is likely to be a key issue in the November presidential election between Republican John McCain, who supports the war, and Democrat Barack Obama, who opposed the war from the start and says he would aim to pull US troops out within 16 months of taking office in January 2009.
Rockefeller has announced his support for Obama.
The administration's record in making its case for Iraq has also been cited by critics of Bush's get-tough policy on Iran. They accuse Bush of overstating the potential threat of Iran's nuclear program in order to justify the possible use of force.
A second report by the committee faulted the administration's handling of December 2001 Rome meetings between defense officials and Iranian informants, which dealt with the Iran issue. It said department officials failed to share intelligence from the meeting, which Rockefeller said demonstrated a "fundamental disdain" for other intelligence agencies.
(China Daily via agencies June 6, 2008)