Daniel Kammen resigned from his post as science envoy for the U.S. State Department on Wednesday, writing a letter to President Trump, calling out his weak statements on hatred and racism.
"My decision to resign is in response to your attacks on core values of the United States," Kammen writes in a message in which the first letter of each paragraph spells out I-M-P-E-A-C-H.
Kammen has served in three federal agencies in the last two decades. He is a UC Berkeley professor who chairs the school's Energy and Resources Group and has been an ardent supporter of efforts to fight climate change.
But it was Trump's handling of the violent and deadly rally in Virginia on Aug. 12 that was the last straw for Kammen.
"Your failure to condemn white supremacists and neo-Nazis has domestic and international ramifications," he said in the letter. "Particularly troubling to me is how your response to Charlottesville is consistent with a broader pattern of behavior that enables sexism and racism, and disregards the welfare of all Americans, the global community and the planet."