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U.S. President George W. Bush discusses the war in Iraq at the Pentagon in Arlington, Virginia on March 19, 2008, the fifth anniversary of the start of the war. Bush defended the decision to go to war, saying Iraqis are better off without Saddam Hussein, and that it is better to be fighting Al Qaida in Iraq than in the U.S. (UPI Photo/Roger L. Wollenberg)

Army Gen. David Petraeus, the U.S. commander in Iraq, and U.S. Ambassador to Iraq Ryan Crocker are to testify before Congress in April regarding troop levels in Iraq. Last year, Petraeus recommended about 30,000 combat troops be re-deployed and not replaced.

"I will await their recommendations before making decisions on our troop levels in Iraq," Bush said during a speech at the Pentagon marking the five-year anniversary of the U.S.-led invasion.

Any reduction "must not jeopardize the hard-fought gains our troops and civilians have made over the past year," he said.

Petraeus has warned against a quick drawdown, saying it could result in increased violence, and extremists and insurgents regaining ground.

"(Having) come so far and achieved so much, we're not going to let this happen," he said.