A classified U.S. report doubts that Iran’s opposition would take power following either a short or extended U.S. military campaign.

A classified report by the National Intelligence Council found that even a large-scale assault on Iran launched by the United States would be unlikely to oust the Islamic republic’s entrenched military and clerical establishment, a sobering assessment as the Trump administration raises the specter of an extended military campaign that officials say has “only just begun.”

The National Intelligence Council, or NIC, is composed of veteran analysts who produce classified assessments meant to represent the collective wisdom of Washington’s 18 intelligence agencies.

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