He did NOT say he wasn't briefed about the documents. He said he wasn't told about that specific report.
Asked if he knows whether the information is true, Rumsfeld said: "No, I don't. It's something that obviously merits looking into."
Later, he suggested it was not unusual that he had not been briefed on the allegation, which was publicly disclosed last week.
"The idea that we're supposed to know what's going to be on every single document or report that comes out of this department . . . doesn't quite appreciate the hundreds and hundreds and hundreds of reports that are put out," Rumsfeld said.