In a separate poll released Monday, Americans expressed skepticism about the turnover of political control to Iraqis at a time the country has not been stabilized.
In a CNN-USA Today-Gallup poll, six in 10 Americans said the handover of authority to Iraqis at such an unstable point is a sign of failure, while about three in 10, 32 percent, said the handover of authority on schedule is a sign of success.
Six in 10 said they think it is unlikely internal security will be established in Iraq in the next five years and slightly more, 63 percent, said they think US troops will be in Iraq for another three years or more.
Americans would prefer a shorter time for the US military presence. Seven in 10 said the US should have a significant number of troops in Iraq two years or less.
The Gallup poll found that despite their doubts, a majority, 54 percent, had hopes the transfer of authority to the Iraqis could improve the situation in that country.
The Gallup poll of 1,005 adults was taken June 21 to June 23 and has a margin of error of 3 percentage points.
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