Maybe it's Cheney who is blocking the investigation of the UN's oil for food program:

"However, during his time as CEO, Halliburton was selling millions of dollars to Iraq in supplies for its oil industry. The deals were done through old subsidiaries of Dresser Industries. It was done under the auspices of the corrupt UN Oil for Food Program.

Halliburton worked with Iran and Libya as well, using its own subsidiaries."

http://www.cbc.ca/fifth/dickcheney/vice.html