Congress, Jenner was the chairman of the Committee on Rules and Administration during the Eighty-third Congress. He was also a member of the Subcommittee on Internal Security. He was a strong supporter and friend of Joseph McCarthy and engaged in McCarthyism. Jenner and McCarthy were both part of "a core of isolationist Republicans in the Senate" along with Herman Welker of Idaho and George W. Malone of Nevada. In 1950, when McCarthy issued a report falsely accusing a number of State Department employees of being secret Communists (see Tydings Committee), Jenner supported him, claiming that the State Department had engaged in "the most scandalous and brazen whitewash of treasonable conspiracy in our history" and stating: "Considering the fact that we are now at war ... how can we get the Reds out of Korea if we cannot get them out of Washington?" When McCarthy was censured by the Senate in 1954, Jenner gave a speech suggesting that censure resolution "was initiated by the Communist conspiracy." In the Senate, Jenner was a strident opponent of General George Marshall, who was appointed Secretary of Defense in 1950. During the confirmation debate, Jenner and McCarthy formed part of a group of militantly anti-communist Republican Senators that attacked Marshall. Jenner "delivered a shrill, hour-long attack on the nominee" in which he also disparaged President Harry S. Truman and Secretary of State Dean Acheson. Using McCarthist rhetoric, Jenner accused the Truman administration of "bloody tracks of treason" and called Marshall "a living lie" who was "joining hands once more with this criminal crowd of traitors and Communist appeasers ... under the direction of Mr. Truman and Mr. Acheson." Jenner also "denounced and blamed Marshall for the Pearl Harbor defeat and for his role in helping FDR 'trick America into a war,' the extension of lend-lease to the Communist Soviet Union, the 'selling out' of Eastern Europe at Yalta, the loss of China, and the inclusion of an offer of aid to the Soviet Union under the Marshall Plan." When Marshall was informed of Jenner's speech, the former general replied: "Jenner? Jenner? I do not believe I know the man." In 1951, after President Truman dismissed General Douglas MacArthur for insubordination, Jenner gave a speech on the floor of the Senate in which he said: "I charge that this country today is in the hands of a secret inner coterie, which is directed by agents of