Here is an excerpt from Hillary's Letter calling for an investigation of Halliburton:

"To that end, I respectfully request that you convene a hearing to investigate the Iraq War contracts awarded to private contractor KBR. My request comes on the heels of a report today that Charles Smith, the Pentagon official who was responsible for the management of the largest contract in Iraq, claimed that he was removed from his position when he refused to authorize $1 billion in questionable charges to KBR. After his removal, his successors approved the charges that Smith had previously refused. The report goes on to state that while Pentagon officials denied Mr. Smith’s account, they nevertheless reversed his previous denial because they claimed blocking payment to KBR would have an adverse impact on the services provided to our troops in the field."