Gen. David Petraeus told a Senate committee that when those forces have pulled out, there should be a 45-day period of consolidation and evaluation.
No more American troops should come home in the weeks after the final brigades from the past year's military buildup pull out in July, the top U.S. commander in Iraq told politicians in Washington on Tuesday.
Gen. David Petraeus told a Senate committee that when those forces have pulled out, there should be a 45-day "period of consolidation and evaluation."
"At the end of that period we will commence a process of assessment to examine the conditions on the ground, and, over time, determine when we can make recommendations for further reductions," he said.
"This approach does not allow establishment of a set withdrawal timetable."
With last year's surge, which sent 30,000 troops to Iraq, the U.S. has about 158,000 troops in Iraq. That number is expected to drop to 140,000 by summer.
"As we look to the future, our task together with our Iraqi partners will be to build on the progress achieved and to deal with the many challenges that remain," Petraeus said. "I do believe that we can do this while continuing the ongoing drawdown of the surge forces."
'Significant but uneven security progress'
But under questioning by Sen. Carl Levin, chairman of the Senate Armed Services Committee, Petraeus said he could not predict when troop reductions would be resumed or how many U.S. troops were likely to remain in Iraq by the end of this year
Speaking seven months after his last appearance, Petraeus said there has been "significant but uneven security progress in Iraq."
Petraeus noted that levels of violence and civilian deaths have been "reduced substantially," extremists have been dealt serious blows and Iraqi security forces have improved.
But he warned that the situation in certain areas is still unsatisfactory, noting that the progress made since last spring is fragile and reversible.
"Still, security in Iraq is better than it was when [U.S. Ambassador to Iraq Ryan] Crocker and I reported to you last September," he said. "And it is significantly better than it was 15 months ago when Iraq was on the brink of civil war and the decision was made to deploy additional forces to Iraq."
The three presidential contenders took time off the campaign trail to appear in Washington Tuesday to question Petraeus, who appeared with Crocker, about Iraq.
Republican Senator John McCain and Democratic senators Hillary Clinton and Barack Obama all sit on committees that are to receive status reports.
McCain, the senior Republican on the armed services panel and Republican presidential hopeful, supports the war and the surge and has repeatedly praised Petraeus. Both Obama and Clinton have made withdrawing troops from Iraq as soon as possible key planks of their campaigns.
At the Senate hearing, McCain said the U.S. is "no longer staring into the abyss of defeat and can look ahead to the genuine prospect of success."
Withdrawing troops before adequate security is established would create a "defeat that is terrible and long-lasting," he said.
Orderly withdrawal: Clinton
But Clinton said it's time to "begin an orderly process of withdrawing our troops."
There has not been sufficient progress in Iraq, she said, and the conditions Petraeus has proposed for further troop reductions lack specificity.
"How are we to judge, General Petraeus, what the conditions are or should be and the action you and the administration would recommend pursuing based on them?" she asked.
Petraeus said there are a number of factors to consider when making recommendations for further reduction of troops.
He said these factors are fairly clear and include the state of enemy forces, the strength of Iraqi forces and the local government, and the economic and political situations.
It's not a precise mathematical exercise he warned, and involves commanders sitting down with their Iraqi counterparts and assessing whether forces can be reduced.
During Petraeus's testimony last September, Clinton said his reports about the progress in Iraq "require the willing suspension of disbelief."
Obama calls for 'measured pressure'
Clinton's rival Obama, who spoke during the afternoon session, said Iraqi leaders need to feel "measured pressure," including a timetable for U.S. troop withdrawal and increased diplomatic action in the region that includes Iran.
"If [Iraqi Prime Minister Nouri] al-Maliki can tolerate Iran, then we should be talking to [Iranian President Mahmoud Ahmadinejad] as well," said Obama. "I do not believe we're going to stabilize the situation without him."
Obama also questioned whether aiming for a stable, democratic Iraq that's free from al-Qaeda and Iranian influence is an unreasonable expectation, considering the cost of the war in money and lives.
"If our criteria is the messy, sloppy status quo, with no huge outbreaks of violence, an Iran that is not an al-Qaeda base and no threats to its neighbours, that seems like a measurable timeframe," said Obama.
Crocker responded that while he didn't want to sound like a broken record, that the situation in Iraq is "hard and complicated."