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FILE - This May 17, 1973 file photo shows Fred D. Thompson, Chief Minority Counsel of the Senate Watergate Committee, left, talking with Sen. Howard Baker, R-Tenn. during the Watergate hearings on Capitol Hill in Washington. . Baker, who asked what President Richard Nixon knew about Watergate, has died. He was 88. Baker, a Republican, served 18 years in the Senate. He earned the respect of Republicans and Democrats alike and rose to the post of majority leader. He served as White House chief of staff at the end of the Reagan administration and was U.S. ambassador to Japan during President George W. Bush's first term. (AP Photo, File) ( Obit Howard Baker )

FILE - This March 21, 2012 file photo shows former Senate Majority Leader Howard Baker in Washington, who has died. (AP Photo/Carolyn Kaster, File) ( Obit Baker )

FILE - This Feb. 11, 1982 file photo shows Senate Majority Leader Howard Baker of Tenn., center, flanked by Sen. Paul Laxalt, R-Nev., left, and House Minority Leader Robert Michel of Ill. outside the White House in Washington following a meeting with President Ronald Reagan. Baker, who asked what President Richard Nixon knew about Watergate, has died. He was 88. Baker, a Republican, served 18 years in the Senate. He earned the respect of Republicans and Democrats alike and rose to the post of majority leader. He served as White House chief of staff at the end of the Reagan administration and was U.S. ambassador to Japan during President George W. Bush's first term. (AP Photo/Jeff Taylor, File) ( Obit Howard Baker )

FILE - This Dec. 13, 1980 file photo shows President-elect Ronald Reagan, center, talking with Sen. Ted Stevens, R-Alaska, right, and Sen. Howard Baker, R-Tenn. during a luncheon at Blair House in Washington. . Baker, who asked what President Richard Nixon knew about Watergate, has died. He was 88. Baker, a Republican, served 18 years in the Senate. He earned the respect of Republicans and Democrats alike and rose to the post of majority leader. He served as White House chief of staff at the end of the Reagan administration and was U.S. ambassador to Japan during President George W. Bush's first term. (AP Photo/Bob Daugherty, File) ( Obit Howard Baker )

FILE - In this Nov. 7, 1972, file photo, U. S. Sen. Howard H. Baker Jr., and his wife, Joy, celebrate his election to a second term in Knoxville, Tenn. Baker defeated U.S. Rep. Ray Blanton in a landslide. Baker died Thursday from complications from a stroke in his hometown of Huntsville, Tenn, at age 88. (AP Photo/Knoxville News Sentinel, File) ( Baker Obit )

FILE - This Nov. 10, 1987 file photo shows Treasury Secretary James Baker, left, and White House Chief of Staff Howard Baker huddle on Capitol Hill in Washington as they prepare to meet with Congressional negotiators to agree on ways to cut the federal deficit. Baker, who asked what President Richard Nixon knew about Watergate, has died. He was 88. Baker, a Republican, served 18 years in the Senate. He earned the respect of Republicans and Democrats alike and rose to the post of majority leader. He served as White House chief of staff at the end of the Reagan administration and was U.S. ambassador to Japan during President George W. Bush's first term. (AP Photo/John Duricka, File) ( Obit Howard Baker )

In a July 1981 photo, Sen. Howard Baker, right, with Knoxville Zoo Director Guy Smith III, is greeted by Little Diamond in Knoxville, Tenn. The first African elephant bred and born in captivity in the Western Hemisphere, Little Diamond died Tuesday, June 17, 2014, at the North Carolina Zoo in Asheboro, N.C., at age 36. (AP Photo/Knoxville News Sentinel) ( NC Zoo Elephant )

FILE - In an April 11, 1977, file photo, U.S. Sen. Howard H. Baker, Jr., right, encourages the University of Tennessee football team as coach Johnny Majors, left, listens in Knoxville, Tenn. Baker died Thursday from complications from a stroke in his hometown of Huntsville, Tenn, at age 88. (AP Photo/Knoxville News Sentinel, File) ( Baker Obit )

FILE - In a Feb. 11, 1982, file photo, U.S. Sen. Howard H. Baker Jr., left, and Tennessee Gov. Lamar Alexander (now an U.S. senator) meet the press during the annual Lincoln Day Dinner in Knoxville, Tenn. Baker died Thursday, June 26, 2014, from complications from a stroke in his hometown of Huntsville, Tenn, at age 88. (AP Photo/Knoxville News Sentinel, File) ( Baker Obit )

FILE - This Dec. 4, 1980 file photo shows Senate Majority Leader Robert Byrd of W.Va., right, talking to the man who will replace him, Sen. Howard Baker, R-Tenn., on Capitol Hill in Washington. Baker, who asked what President Richard Nixon knew about Watergate, has died. He was 88. Baker, a Republican, served 18 years in the Senate. He earned the respect of Republicans and Democrats alike and rose to the post of majority leader. He served as White House chief of staff at the end of the Reagan administration and was U.S. ambassador to Japan during President George W. Bush's first term. (AP Photo/Chick Harrity, File) ( Obit Howard Baker )

FILE - In this Feb. 19, 1992, file photo, President George H.W. Bush, left, speaks with former U.S. Sen. Howard H. Baker Jr. in Knoxville, Tenn. Baker died Thursday, June 26, 2014, from complications from a stroke in his hometown of Huntsville, Tenn, at age 88. (AP Photo/Knoxville News Sentinel, File) ( Baker Obit )

FILE - In this June 17, 1991, file photo, former U.S. Sen. Howard Baker Jr. poses for a photo in Huntsville, Tenn. Baker died Thursday from complications from a stroke in his hometown of Huntsville at age 88. (AP Photo/Knoxville News Sentinel) ( Baker Obit )