A State Department science envoy's letter of resignation appears to have a hidden message for the president: "IMPEACH."

Daniel M. Kammen, one of seven science envoys for the State Department, tweeted a photo of the coded letter of resignation on Wednesday morning. Kammen cited President Donald Trump's "failure to condemn white supremacists and neo-Nazis," and his response to a deadly "alt-right" rally in Charlottesville, Virginia as the reason for stepping down. 

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