WASHINGTON – Fred Thompson gained an image as a tough-minded investigative counsel for the Senate Watergate committee. Yet President Nixon and his top aides viewed the fellow Republican as a willing, if not too bright, ally, according to White House tapes.

Thompson, now preparing a bid for the 2008 GOP presidential nomination, won fame in 1973 for asking a committee witness the bombshell question that revealed Nixon had installed hidden listening devices and taping equipment in the Oval Office.

Those tapes show Thompson played a role counter to his public image. He comes across as a partisan willing to cooperate with the Nixon White House’s effort to discredit the committee’s star witness.

It was Thompson who tipped off the White House that the Senate committee knew about the tapes. They eventually cinched Nixon’s downfall in the scandal resulting from the break-in at Democratic headquarters in the Watergate complex in Washington and the subsequent White House cover-up.

“Legalisms aside, it was inconceivable to me that the White House could withhold the tapes once their existence was made known. I believed it would be in everyone’s interest if the White House realized, before making any public statements, the probable position of both the majority and the minority of the Watergate committee,” Thompson wrote in his book.