U.S.
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 was 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. Exemplifying 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 the Soviet Government. Our only choice is to impeach President Truman and find out who is the secret invisible government.”