[JURIST] TIME magazine reporter Matthew Cooper said Sunday in an article he has written on his grand jury testimony [text] that Dick Cheney's chief of staff Lewis Libby [Wikipedia profile] contributed information to the story revealing the identity of Valerie Plame [Wikipedia profile] as a CIA operative. Cooper said he spoke to Libby regarding a trip to Africa that Plame authorized for her husband, former US Ambassador Joseph Wilson [Wikipedia profile], to investigate uranium sold to Iraq. Cooper said Libby replied, "Yeah, I've heard that too." The White House has been denying that either Libby or White House Deputy Chief of Staff Karl Rove [Wikipedia profile] had any connections to the leak for the past two years. Cooper said he was asked by prosecutor Patrick Fitzgerald during the grand jury hearing if Rove told him how he learned Plame worked at the CIA and Cooper responded he did not. Rove has contended that he learned the information from the news media [JURIST report]. AP has more.