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As the ranking member of the Senate Foreign Relations Committee, Hickenlooper proposed an amendment to the Foreign Assistance Act which would slash foreign aid to any country expropriating the privately owned property of American sugar plantations and oil companies.<ref name="The First Hickenlooper"/> The measure was opposed by President [[John F. Kennedy]] over concerns that diplomatic ties to [[Latin America]] would be weakened. The amendment was defeated by a 40–45 Senate vote.<ref>[https://www.govtrack.us/congress/votes/87-1962/s268 S. 2996. AMEND. BARRING AID TO ANY NATION WHICH EXPORTED TO U.S.S.R. OR NATION DOMINATED BY U.S.S.R. ANY WAR IMPLEMENTS OR ARTICLES OF STRATEGIC SIGNIFICANCE.]. ''GovTrack.us''. Retrieved February 21, 2021.</ref>

As the ranking member of the Senate Foreign Relations Committee, Hickenlooper proposed an amendment to the Foreign Assistance Act which would slash foreign aid to any country expropriating the privately owned property of American sugar plantations and oil companies.<ref name="The First Hickenlooper"/> The measure was opposed by President [[John F. Kennedy]] over concerns that diplomatic ties to [[Latin America]] would be weakened. The amendment was defeated by a 40–45 Senate vote.<ref>[https://www.govtrack.us/congress/votes/87-1962/s268 S. 2996. AMEND. BARRING AID TO ANY NATION WHICH EXPORTED TO U.S.S.R. OR NATION DOMINATED BY U.S.S.R. ANY WAR IMPLEMENTS OR ARTICLES OF STRATEGIC SIGNIFICANCE.]. ''GovTrack.us''. Retrieved February 21, 2021.</ref>

Hickenlooper was a supporter of U.S. military intervention in the [[Vietnam War]] and co-authored the [[Gulf of Tonkin Resolution]].

Hickenlooper was a supporter of U.S. military intervention in the [[Vietnam War]] and co-authored the [[Gulf of Tonkin Resolution]]. Nearly all of his concurrences with administrations under Democrat presidencies were on foreign policy matters.<ref name="The First Hickenlooper"/>

===Intra-party disputes===

===Intra-party disputes===