Jeb Bush says it was a mistake to invade Iraq.
The Republican White House prospect on Thursday clarified his position on the war his brother authorised.
The former Florida governor ended several days of confusion about his foreign policy while campaigning in Arizona.
Bush said that given the benefit of hindsight, "I would have not gone into Iraq."
In interviews earlier in the week, Bush refused to say whether he would have launched the 2003 invasion if he'd been in President George W. Bush's shoes.
News that makes sense
Your trusted source for staying up-to-date with the world around you. Get free daily news updates and analysis, straight to your inbox.
He said he was reluctant to say the invasion was the wrong decision because he didn't want to dishonour the lives of American troops killed there.
The justification for the war was based on faulty intelligence that Iraq possessed weapons of mass destruction.

