WASHINGTON (CNN) -- President Bush on Tuesday announced a troop deployment shift for America's two wars, a move that reflects a more stable Iraq and an increasingly volatile Afghanistan. President Bush said Tuesday that he soon will start bringing some U.S. troops home from Iraq. Through early next year, about 8,000 American troops will leave Iraq and not be replaced. Some 4,500 other U.S. service members will go to Afghanistan. Bush also emphasized the U.S. intention to help Pakistan defeat insurgents who are using the country's tribal areas to stage attacks in Afghanistan. "Iraq, Afghanistan and parts of Pakistan pose unique challenges for our country," Bush said Tuesday in a speech at the National Defense University in Washington. "Yet they are all theaters in the same overall struggle."

"The effort in
Afghanistan must move to the forefront and once again become our top priority," he said.