The letter appears to be President Trump’s opening bid to see if a newly vulnerable Iran is willing to negotiate.

Iran says it would consider negotiations with the United States if talks were confined to concerns about the militarization of the country’s nuclear program

Trump said on Friday he had warned Tehran in a letter it could face military action unless it agreed to talks for a nuclear deal. In a furious response on Saturday, Ayatollah Ali Khamenei said Iran would not negotiate with "bullying governments" insisting on talks.