What did Karl Rove do when he learned of the Spring 2003 Iran offer for comprehensive negotiations with the U.S.?

Gareth Porter has an important article out today, "Rove Said to Have Received 2003 Iranian Proposal."

Porter writes:

Karl Rove, then White House deputy chief of staff for President George W. Bush, received a copy of the secret Iranian proposal for negotiations with the United States from former Republican Congressman Bob Ney in early May...