The deputy head of the Democratic National Committee is under fire—again—from far-right activists after he posed with a copy of a "antifa" book and suggested anti-fascist activism is President Donald Trump's worst nightmare.

Congressman Keith Ellison (D-Minn.) has been a lightning rod for conservatives for his support for Senator Bernie Sanders's presidential campaign, for his race and for his Islamic faith, but his tweet on Wednesday of a picture of himself holding up Antifa: The Anti-Fascist Handbook by Mark Bray, enraged his opponents again.