Capitol Hill. Photo: Wiki Commons.

Reuters – As debate rises in Washington over the first thaw in relations between Iran and the United States in decades, powerful oil companies are opting for an unusual tactic: silence.

Oil companies such as Exxon Mobil Corp and ConocoPhillips could earn huge profits if the United States loosened economic sanctions on Iran, allowing access to its oil and natural gas fields, some of the world’s largest and least costly to produce.

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