Assistant prosecutor Richard Ben-Veniste, left, arrives with unidentified woman at U.S. District Court in Washington on Friday, Dec. 27, 1974 for the Watergate cover-up trial. He is scheduled to deliver the government's rebuttal as the case nears completion following 11 weeks of testimony and argument. (AP Photo)

Deputy CIA Director Vernon A. Welters is the center of attention for cameramen as he arrives at U.S. District Court for the Watergate cover-up trial in Washington on Friday, Nov. 15, 1974. Walters is scheduled to testify on the agency's reaction in the days following the June 17, 1972 break-in at Democratic National Committee headquarters. (AP Photo)

Country western stars Johnny Cash and wife June Carter Cash arrive at U.S. District Court in Washington to watch the Watergate cover-up trial, Nov. 11, 1974. The two were invited by prosecutor James Neal. (AP Photo/Bob Daugherty)

Country western stars Johnny Cash and wife June Carter Cash arrive at U.S. District Court in Washington to watch the Watergate cover-up trial, Nov. 11, 1974. The two were invited by prosecutor James Neal. (AP Photo/Bob Daugherty)

American singer Johnny Cash and his wife, singer June Carter Cash, arrive at the U.S. District Court in Washington, November 11, 1974, following an invitation by prosecutor James Neal to watch the Watergate trial. (AP Photo)

Three of the assistant Washington prosecutors in the Watergate cover-up trial arrive at U.S. District Court in Washington on Friday, Nov. 8, 1974. From left are: Richard Ben-Veniste, Jill Volner, and James Neal. (AP Photo/CB)

Picture shot in August 1974 of Republican president of the United States Richard Nixon giving a speech at the White House following his resignation from the presidency after the Watergate scandal. Richard Nixon had been elected in 1968 and re-elected in 1972.

HOTO: EAST NEWS/AFP Picture dated 09 August 1974 of Republican president of the United States Richard Nixon thumbing up after announcing his resignation from the presidency after the Watergate scandal. Richard Nixon had been elected in 1968 and re-elected in 1972.

On the day of his resignation, Aug. 9, 1974, Richard M. Nixon waves goodbye from the steps of his helicopter as he leaves the White House following a farewell address to his staff. The Watergate scandal forced Nixon to become the first U.S. president to resign from office. (AP Photo/Chick Harrity)

The U.S. presidential yacht Sequoia, carrying President Richard Nixon and his family, returns to port after a late-afternoon cruise on the Potomac River in Washington, D.C., Monday, Aug. 5, 1974. A few hours earlier Nixon made his latest Watergate disclosure. (AP Photo)

U. S. District Court Judge John J. Sirica, left, talks with his law clerk Todd Christofferson during the court's lunch recess Friday, August 3, 1974 in Washington. Earlier Friday Sirica sentenced former White House counsel John W. Dean III to prison for his part in the Watergate cover-up. The dome of the U. S. Capitol is in the background. (AP Photo/William Smith)

Richard Ben-Veniste, right, Jill Volner, both of the Special Watergate Prosecutor's office, arrive at U.S. District Court in Washington on Friday, Aug. 2, 1974. Both were on hand for the delivery of additional White House tapes to Judge John Sirica. The prosecutor's office is seeking the tapes for the upcoming Watergate cover-up trial of six former top presidential aides. (AP Photo/WAS)

Martha Mitchell, is shown in Washington, in 1974. She is changing her act, picking up the pieces of a life she says was destroyed by Watergate. (AP Photo/Harvey Georges)

Special Watergate Prosecutor Leon Jaworski arrives at U.S. District Court in Washington on Friday, July 26, 1974, accompanied by two of his assistants seeking compliance to the Supreme Court that President Richard Nixon produce White House tapes for use in the Watergate cover-up trial. From left are; Philip Lacovara; Jaworski; and Richard Ben-Veniste. (AP Photo)

Georgia Gov. Jimmy Carter had his say at a press conference shortly before he spoke to the Southern Baptist Convention on Thursday, June 13, 1974 in Dallas, Tex. He said he expected President Nixon to be impeached and convicted by the Senate because of his refusal to turn over more evidence to the house judicial committee. He said at the press conference that the Watergate scandal

Dan Mann, left, administration officer for the Watergate Special Prosecution Force in Washington, D.C., communicates with deaf messengers hired to deliver documents and sort the mail for Leon Jaworski's lawyers, June 9, 1974. They are, from right, Meriam Schroeder, Buddy Pitcher and Robin Edwards. They were hired because they can't hear discussions among prosecution staffers. (AP Photo)

Three White House lawyers disagree on where their car is parked as they leave U.S. district court in Washington Monday, June 3, 1974 during Watergate trial. They are, from left, Michael Sterlacci, James St. Clain and Jerome Murphy. (AP Photo)

White House lawyer James St. Clair talks with newsman prior to entering U.S. district court in Washington Monday, May 13, 1974 for the Watergate trial. (AP Photo)

Democratic National Committee Chairman Robert S. Strauss tells newsmen in Washington on Wednesday, May 8, 1974, that the Democratic Party will hold another fund raising telethon in June. Strauss said party leaders had previously decided to stay away from President Richard Nixon's Watergate troubles and the impeachment move in the House but added,

** FILE ** President Richard M. Nixon is shown pointing to the transcripts of the White House tapes in this April 29, 1974, file photo, after he announced during a nationally-televised speech that he would turn over the transcripts to House impeachment invesigators. 30 years ago, on Aug. 9, 1974, US-President Richard M. Nixon resigned due to the Watergate affair. (AP Photo) ** zu unserem Korr **