This report has the details : http://www.thedailybeast.com/blogs-and-stories/2009-05-13/cheneys-role-deepens/
But the bottom line is that apparently Cheney's office suggested waterboarding a captured Iraqi intel officer about supposed links between Iraq and Al Qaeda. It didn't happen, because the interrogators refused, fining the request "reprehensible." That part is good. Somebody drew the line.
But the key point here is that the request was completely improper. Regardless of any and all arguments about torture, terrorists and yada yada proffered by apologists, one fact that is beyond dispute is that the Geneva Conventions did apply to the war in Iraq. No ifs, ands or buts about it. The Iraq was was pure state-to-state conflict between signatories of the Geneva Conventions. If they didn't apply in this case then they simply don't apply anytime. The Iraqi in question was an official of the Iraqi government, acting in his official capacity. If the Geneva Conventions didn't apply yo him, they apply to no one. The fact that the Vice President's office made the request shows a complete contempt for the law. What possible excuse was there?