U.S. Defense Secretary Donald Rumsfeld today accused Iran of sending its Revolutionary Guards into Iraq to foment violence.

Rumsfeld declined to give details, but his statement marked the first time he's said these forces are in Iraq. When asked if the infiltration is backed by Iran's central government, he said "of course" and added: "The Revolutionary Guard doesn't go milling around willy-nilly."

Iran is "putting people into Iraq to do things that are harmful to the future of Iraq," Rumsfeld told a Pentagon news conference. The action is one Iran "will look back on as having been an error in judgment," he said...