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Iran renewed threats on Sunday to close the Strait of Hormuz unless sanctions against it were revoked, though it remains unclear how Tehran could shut down the vital oil shipping channel given the significant American military presence there.

The Iranian parliament is considering a bill calling for the strait to be closed. The assembly has little control over national defense and foreign policy decisions and, while the bill would be largely symbolic, it would indicate the legislature's support behind any leadership decision to close the strait.