As of this evening, the $10.5 billion from the original hurricane relief bill will probably all have been spent, the AP reports budget aides as having said.
The next proposal would spend over $50 billion in less than two months. As for the investigation:
...Democratic leader Harry Reid of Nevada said on the Senate floor that such a probe, led by Republican lawmakers, would be as unbiased as having a baseball pitcher "call his own balls and strikes."
He said Democrats would support the $51.8 billion spending bill, but he complained that most of the money would go to the Federal Emergency Management Agency -- "Is there anyone, anyone, who believes that we should continue to let the money go to FEMA?" -- and said further measures were needed to deal with health care, housing and education...