Daniel M Kammen who was appointed Science Envoy for the State department in 2016 has resigned in protest at Trump's implicit support for white supremacist violence at Charlottesville and posted his resignation letter online.
http://www.independent.co.uk/news/world/americas/us-politics/trump-science-envoy-resigns-letter-daniel-kammen-charlottesville-president-response-racism-sexism-a7909041.html
Daniel M Kammen is a Professor of Energy at the University of California, Berkeley and the Director of the Renewable and Appropriate Energy Lab.
In his letter he says:
My decision to resign is in response to your attacks on core values of the United States. Your failure to condemn white supremacists and neo-Nazis has domestic and international ramifications
In a nod to the mass resignation letter published last week by 16 members of PCAH (Presidential committee on Arts & Humanities) where the initial letter of each paragraph spelled out the word RESIST, Daniel M Kammen's letter of resignation has paragraph letter headers that spell out the word IMPEACH.