President George W. Bush has authorized a reduction in U.S. combat troops in Iraq, Secretary of Defense Donald Rumsfeld said Friday during a town hall meeting at Camp Falluja, Iraq. "At the recommendation of our military commanders and in consultation with our coalition partners and with the Iraqi Government, President Bush has authorized an adjustment in U.S. combat brigades in Iraq from 17 to 15," Rumsfeld told 400 to 500 U.S. troops. The adjustments will reduce forces in Iraq below the baseline level of 138,000 -- which has provided the guideline for most of the year -- by spring of 2006, as well as below the high of 160,000 troops as Iraqi elections approached, Rumsfeld said. The exact amount of the reduction was not given, and Rumsfeld said details would be provided later by the Pentagon. Further reductions will be considered next year when Iraq's new government is in place and prepared to discuss the future, he was quoted as saying by CNN.