WASHINGTON (Reuters) - Investigators have found no evidence Iraq aided al Qaeda attempts to attack the United States, a commission investigating the Sept. 11, 2001 hijackings said on Wednesday, undermining Bush administration arguments for war.

The report by commission staff said al Qaeda leader Osama bin Laden had met with a senior Iraqi intelligence officer in 1994 and had explored the possibility of cooperation, but the plans apparently never came to fruition.

President Bush and Vice President Dick Cheney this week reiterated pre-war arguments that an Iraqi connection to al Qaeda, which is blamed for the Sept. 11 attacks, represented an unacceptable threat to the United States.

However, the commission said in a staff report, "We have no credible evidence that Iraq and al Qaeda cooperated on attacks against the United States."

The U.S. Supreme Court brought two years of pleadings and passion over the Pledge of Allegiance to a crashing anticlimax Monday when it ruled that a Sacramento atheist, who challenged the phrase "under God" in daily recitals in his daughter’s classroom, had no right to sue on her behalf.

The court left the current version of the pledge intact but spurned pleas from opposing sides in the case to decide whether the language violates the constitutional separation of church and state.