The conservative free-market group FreedomWorks has started what could become a last-ditch effort to defend Scott Pruitt, Trump’s embattled Environmental Protection Agency chief, from the throngs of what it calls a liberal attack to oust him.

“The radical left is running a smear campaign against @EPAScottPruitt in an attempt to force him out of the EPA,” the group tweeted late Thursday, before urging its followers to call the White House.