The pair will testify in further congressional hearings over Monday and Tuesday on whether the overall US strategy in Iraq is working.
'Damning picture'
After many leaks of the upcoming report, decision-makers are already weighing-in for, and against, a withdrawal of troops.
"I'll work with my colleagues and others to try to work for an early end to the war in Iraq," senator Edward Kennedy said.
For months, Bush has been asking the American public to wait for the White House report on Iraq, incorporating Petraeus's advice, before they make up their minds, said Al Jazeera's Viviana Hurtado.
But recent reports preceding Petraeus's testimony have painted a damning picture of the political and security situation in the war-torn country, she said.
In Baghdad, where it is expected that the government of Nouri al-Maliki will be blamed for any failures, Iraqi leaders say that, whatever the verdict, they are not ready to do it alone.
National reconciliation
Hoshyar Zebari, the Iraqi foreign minister, said: "Despite our emphasis on national reconciliation at home, we also need to be reconciled with our neighbourhood, with the international community at large.
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"Iraq is still under foreign occupation and Iraqis continue to die in great numbers"
albaghawy, Luxembourg
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"And this is a critical period for us that we need your support, your commitment especially for our immediate neighbours."
This sentiment was echoed on Sunday by a former US national security adviser.
"I think we need to be there for the sake of the region until we have an Iraq that is stable and able to be a partner in the region not be an irritant," Brent Scowcroft said.
So far George Bush, the US president, has given no indication he will change his current course and opposition Democrats do not have enough votes to force any change in policy.