U.S. Senator Carl Levin says it's obvious the Iraqi government has made no progress and the only way to propel it is to begin pulling out U.S. troops.
The Michigan Democrat is chairman of the Armed Services Committee.
He has proposed legislation with Rhode Island Republican Jack Reed that would order President Bush to begin pulling out troops in 120 days and end combat by April 2008.
The measure would let some troops remain to conduct counter-terrorism, train the Iraqi security forces and protect U-S infrastructure.
A Bush administration progress report on the war being released this week says the Iraqi government has failed to meet key targets for security, economic and political reform.