Like Gross, Siler was a Taft Republican (or Old Right Republican) who was opposed to entangling military alliances and foreign interventions. Siler was a consistent opponent of foreign aid; he was one of only two congressmen to vote against John F. Kennedy's call up of reserves during the Berlin crisis. He supported Barry Goldwater in 1964 but did not share his interventionist foreign policy views. This non-interventionism did not seem to bother his constituents.