In July of 1973, Fred Thompson, then a Republican attorney for the Senate Watergate committee, (and now a Republican senator from Tennessee), called on a surprise witness, Alexander Butterfield. Butterfield was a former aide to White House chief of staff H.R. Haldeman. The exchange:
Thompson: "Mr. Butterfield, are you aware of the installation of any listening devices in the Oval Office of the President?"
Butterfield: "I was aware of listening devices, yes sir.
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