The real problem is that they may or may not have the proof. I'd think that if these allegations are true, then there must be some evidence of it other than some Iraqi official's testimony.
They don't have any proof. That is why Galloway is there, and why no-one produced any. If they had proof they would show it.
The money was laundered. They didn't ask him if he knew any person or entity that received funds.
His wife got some as "salary" through the charity. The Senators were second rate interrogators.
On what are you basing your commentary?
There is much more than "some Iraqi official's testimony". There is documentation.
In fact one line of questioning that Levin pursued was trying to pin Galloway down on one specific document and asked him if the document was a forgery. Galloway would not say that and said it might be real but the information was false.
I do not think Galloway could be pinned down on perjury as he was more slick than Slick, but I do think his testimony "can and will be used against him".