Hearings of the Senate select committee on the watergate case in Washington, D.C. May 18,1973. (AP Photo)

Senator Sam Ervin, Jr. Chairman of hearings of the Senate select committee on the watergate case in Washington, D.C. May 18,1973. (AP Photo)

Senator Sam Ervin, Jr. Chairman of hearings of the Senate select committee on the watergate case in Washington, D.C. May 18,1973. (AP Photo)

Sen. Daniel K. Inouye (D-Hawaii), a member of the Senate Watergate investigating committee, is shown, May 18, 1973. (AP Photo)

WASHINGTON, May 17, 1973- Members of the Senate Watergate Investigating committee in Washington, D.C., May 17, 1973, From left are; Sen. Lowell Weicker, R-Conn., Sen. Edward Gurney, R-Fla., Chief Minority Counsel Fred Thompson, Sen. Howard Baker, R-Tenn., Sen. Sam Ervin, D-N.C., Chairman, Chief counsel Samuel Dash, Sen, Herman Talmadge, D-Ga., Sen. Daniel Inouye, D-Hawaii and Sen. Joseph Montoya, D-N. Mexico. In foreground is witness Robert Odle. (AP Photo).

Sen. Fred D. Thompson, Chief Minority Counsel of the Senate Watergate Committee, is seen with Sen. Howard Baker (R-Tenn.), during the Watergate hearings in Washington, May 17, 1973. (AP Photo)

Yale Political Union President Wade Cleveland whispers an aside to R. Sargent Shriver before introducing him at a public meeting of the Yale Political Union, Thursday, May 17, 1973 in New Haven. Shriver, who was the speaker of the evening, said that President Nixon should be prepared to choose any ??sdecent alternative that can repair the damage??? of the Watergate scandal. (AP Photo/Bob Child)

Sen. Howard Baker (R-Tenn.), right, confers with minority counselor for the Senate Watergate Committee Fred Thompson, on the steps of the Capitol, May 16, 1973. (AP Photo)

Frank Wills, the security guard who discovered the now infamous Watergate break-in on June 17, is now working as a security guard in another Washington office building shown May 16, 1973. It was Wills chance discovery of a piece of tape attached to a Watergate Basement door latch that lead to the arrest of five men in connection with the breaking into of the democratic national committee offices. (AP Photo)

Former CIA director Richard Helms appears in Washington, before closed hearing of the Senate Appropriations Subcommittee that is investigating government intelligence operations, May 16, 1973. Helms headed the intelligence unit at the time of the break-in at the Democratic Nation Committee headquarters in the Watergate complex. (AP Photo/Henry Griffin)

Daniel Ellsberg, co-defendant in the Pentagon Papers trial, answers questions from newsmen outside the Federal Building in Los Angeles on Tuesday, May 9, 1973. Defense attorneys in the trial said on Tuesday that they will appeal to a higher court immediately if Judge Matt Byrne rejects their demand to throw out the case because of Watergate and White House involvements. (AP Photo/ Wally Fong)

U.S. Sen. Charles Percy, R-Ill., is shown at a news conference on Monday, May 7, 1973 in Bridgeport, Connecticut, where he said that he was pleased at the pending announcement by Attorney General designate Elliott Richardson that Richardson would appoint a special prosecutor in the Watergate investigation, and that the appointment of a special prosecutor was necessary to restore the public?s faith and confidence in government. Percy was in Bridgeport to address a meeting of the Connecticut Business and Industry Association. (AP Photo/Robert Child)

A May 7, 1973 close-up of reporter Bob Woodward, whose reporting of the Watergate case won a Pulitzer for the Washington Post. (AP Photo)

Washington Post writers Carl Bernstein, left, and Robert Woodward, who pressed the Watergate investigation, are photographed in Washington, D.C., May 7, 1973. It was announced that The Post won the Pulitzer Prize for public service for its stories about the Watergate scandal. (AP Photo)

Sen. Charles Percy, R-Ill, answers a question during an interview in his Washington office on May 6, 1973. Percy said if President Richard Nixon???s re-election effort had been left up to the Republican National Committee the Watergate affair would never have taken place. (AP Photo/Charles Tasnadi)

Former presidential advisor H.R. Haldeman is seen outside the new Senate office building where he appeared before a special committee investigating the Watergate matter, May 4, 1973, in Washington. (AP Photo/Paul Vathis)

Martha Mitchell, wife of former Attorney General John Mitchell, answers newsmen's questions outside her lawyer's office after giving a deposition in the Watergate civil case in New York, Thursday, May 4, 1973. (AP Photo)

Martha John Mitchell carries a worn bible, as she makes her way through throngs of newsmen to give a deposition about the Watergate case to a lawyer in New York City on May 3, 1973. "I wouldn't want to have to swear on a dictionary," quipped the wife of former Atty. Gen. John Mitchell. (AP Photo)

Presidential Press secretary, Ron Ziegler talks with newsmen Monday April 30, 1973 at the White House where he announced the President's descision to accept the resignations of Att. Gen. Richard G. Kleindienst and White House aides HR Haldeman and John D. Erlichman in a shakeup stemming from the Watergate affair. He also announced the firing of White Hourse counsel John Dean III. (AP Photo)

Democratic National Committee Chairman Robert F. Strauss, left, speaks out about the Watergate case during a party at the National Democratic Governors Caucus in Huron, Ohio at night on Sunday, April 29, 1973. At the right is South Carolina Gov. John C. West. (AP Photo/Steve Pyle)