Marine Corps Lt. Col. Oliver North, accompanied by his lawyer Brendan Sullivan, was a central figure in the Iran-Contra hearings. Chris Wilkins/AFP via Getty Images hide caption
Iran-Contra
Retired U.S. Marine Lt. Col. Oliver North speaks before giving the invocation at the National Rifle Association Institute for Legislative Action Leadership Forum in Dallas on Friday. The NRA announced Monday that North will become president of the association within a few weeks. Sue Ogrocki/AP hide caption
Duane "Dewey" Clarridge, a CIA veteran, speaks in May 2007 during an Arkansas Committee on Foreign Relations luncheon in Little Rock, Ark. The retired spy criticized the CIA's leadership and said a lack of human intelligence had led to mistakes in Iraq, Iran and North Korea. Mike Wintroath/AP hide caption
Iran-Contra special prosecutor Lawrence Walsh speaks to reporters in 1989. Rick Bowmer/AP hide caption