Bob Greenblatt, the chairman of NBC Entertainment, which produces “The Apprentice,” has declared war on Donald Trump, blasting him as “pompous” and “toxic.”

Greenblatt — who took his NBC role in 2011 when “The Celebrity Apprentice” was already running, but continued airing the show for four more seasons with Trump as host — wrote on Facebook, “The sad state of affairs thanks to a pompous businessman turned reality TV star (whose show consistently ran LAST in its time period, by the way) who thinks speaking his mind is refreshing. It’s actually corrosive and toxic because his ‘mind’ is so demented; and his effect will unfortunately linger long after he’s been told to get off the stage.”

A TV insider snickered, “Greenblatt can be credited as the man who helped make Trump more famous, and appeared at the time to be delighted by the ratings.”

He was more diplomatic at a Television Critics Association panel this month when he denied that NBC was responsible for Trump’s GOP nomination.

A rep for NBC, which cut ties with Trump last year, pointed out: “Bob’s Facebook page is not public.”

This article originally appeared in the New York Post's Page Six.