Another week, another resignation.

This time it is one of the State Department’s science envoys who has publicly resigned over Donald Trump’s response to violence at a white nationalist rally in Charlottesville, and like some other resignations it came with a not-so-hidden message in the text.

Daniel Kammen, a professor at the University of California, Berkely, posted a letter to Twitter saying Mr Trump’s failure to denounce neo-Nazis and the far-Right was part of a disturbing pattern .

"Your failure to condemn white supremacists and neo-Nazis has domestic and international ramifications," he wrote.