Science envoy resigns over Trump – with a letter spelling out 'impeach'

State department’s Daniel Kammen quits with note calling out Charlottesville and Paris accord – and a hidden message in the first letters of each paragraph

One of the US state department’s three science envoys publicly resigned on Wednesday, the latest in a wave of defections over Donald Trump’s response to a white nationalist rally in Charlottesville, Virginia.

Daniel Kammen, a professor at the University of California, Berkeley, said in a letter posted on his Twitter account that Trump had failed to condemn white supremacists and neo-Nazis, part of “a broader pattern of behavior that enables sexism and racism, and disregards the welfare of all Americans, the global community and the planet”.

Related: Ex-intelligence chief: Trump's access to nuclear codes is 'pretty damn scary'

Mr. President, I am resigning as Science Envoy. Your response to Charlottesville enables racism, sexism, & harms our country and planet. pic.twitter.com/eWzDc5Yw6t

What happened in Charlottesville on 12 August?