On May 8 a woman few Americans have heard of, working in a federal post that even fewer know exists, summoned a select group of 45 people to a June meeting in Washington. They were almost exclusively representatives of liberal activist groups. The invitation explained they were invited to develop “future plans for scientific integrity” at the Environmental Protection Agency.

Meet the deep state. That’s what conservatives call it now, though it goes by other names. The administrative state. The entrenched governing elite. Lois Lerner. The federal bureaucracy. Whatever the description, what’s pertinent to today’s Washington is that this cadre of federal employees, accountable to no one, is actively working from within to thwart Donald Trump’s agenda.

There are few better examples than the EPA post of Scientific Integrity Official. (Yes, that is an actual job title.) The position is a legacy of Barack Obama, who at his 2009 inaugural promised to “restore science to its rightful place”—his way of warning Republicans that there’d be no more debate on climate change or other liberal environmental priorities.

Team Obama directed federal agencies to implement “scientific integrity” policies. Most agencies tasked their senior leaders with overseeing these rules. But the EPA—always the overachiever—bragged that it alone had chosen to “hire a senior level employee” whose only job would be to “act as a champion for scientific integrity throughout the agency.”

In 2013 the EPA hired Francesca Grifo, longtime activist at the far-left Union of Concerned Scientists. Ms. Grifo had long complained that EPA scientists were “under siege”—according to a report she helped write—by Republican “political appointees” and “industry lobbyists” who had “manipulated” science on everything from “mercury pollution to groundwater contamination to climate science.”