Although, Richard Nixon enjoyed firmly strong relations with Bhutto and was a close friend of Bhutto, the graph of relation significantly went down under the Presidency of Jimmy Carter. Carter, an anti-socialist, tightened the embargo placed on Pakistan and placed a pressure through the United States Ambassador to Pakistan, Brigadier-General Henry Byroade. The socialist orientation, and Bhutto's proposed left-wing theories, had badly upset the United States, further clinging the bell tolls in the United States as fearing Pakistan's loss as an ally in the Cold war. The leftists and Bhutto's policy towards Soviet Union was seen sympathetic and had built a bridge for the Soviet Union to have gain access in Pakistan's warm water ports, that something both the United States and the Soviet Union had lacked.