- Trump’s science envoy quits in scathing letter with an embedded message: IMPEACHWashington Post
- US science envoy steps down, spells out “impeach” in resignation letterCNN
- State Department Science Envoy Quits With Not-So-Secret Message For Trump: ‘IMPEACH’HuffPost
- Science envoy’s resignation joins the ranks of others sending messages through acrosticsMashable
- Donald Trump’s science envoy Daniel Kammen quits with hidden message in letterNEWS.com.au