A confidential CIA analysis delivered to administration policymakers this week concludes that Iran can survive the U.S. naval blockade for at least three to four months before facing more severe economic hardship, four people familiar with the document said, a finding that appears to raise new questions about President Donald Trump’s optimism on ending the war.

The analysis by the U.S. intelligence community, whose secret assessments on Iran have often been more sober than the administration’s public statements, also found that Tehran retains significant ballistic missile capabilities despite weeks of intense U.S. and Israeli bombardment, three of the people familiar with it said.

Iran retains about 75 percent of its prewar inventories of mobile launchers and about 70 percent of its prewar stockpiles of missiles, a U.S. official said. The official said there is evidence that the regime has been able to recover and reopen almost all of its underground storage facilities, repair some damaged missiles and even assemble some new missiles that were nearly complete when the war began.