A science envoy working for the U.S. State Department announced his resignation on Wednesday with a letter that contained a not entirely subtle message for President Trump: IMPEACH.

Daniel Kammen, science envoy for the State Department, resigned in response to Trump’s “attacks on core values of the United States,” he wrote in a letter addressed to the president. The first letter of each paragraph in the note spell out the word “impeach,” making it clear where Kammen stands on Trump, especially following the president’s tepid response to the demonstrations in Charlottesville, Va. earlier this month.

“Your failure to condemn white supremacists and neo-Nazis has domestic and international ramifications,” Kammen wrote. “Particularly troubling to me is how our 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 economy and the planet.”

Kammen’s resignation comes after Trump’s entire Arts and Humanities Council quit. Trump also disbanded his business council after a growing number of CEOs resigned in the wake of the president’s remarks on Charlottesville.

Get our Politics Newsletter. The headlines out of Washington never seem to slow. Subscribe to The D.C. Brief to make sense of what matters most. Please enter a valid email address. Sign Up Now Check the box if you do not wish to receive promotional offers via email from TIME. You can unsubscribe at any time. By signing up you are agreeing to our Terms of Use and Privacy Policy . This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. Thank you! For your security, we've sent a confirmation email to the address you entered. Click the link to confirm your subscription and begin receiving our newsletters. If you don't get the confirmation within 10 minutes, please check your spam folder.

Write to Mahita Gajanan at mahita.gajanan@time.com.