Confirmation hearings have quickly become a prime target of protesters during President Donald Trump’s time in office, with frustrated voters confronting lawmakers in the corridors of Congress or occasionally dressing up like a Monopoly man. On Thursday, some new creatures emerged during a hearing for Acting Interior Secretary David Bernhardt: a knot of swamp monsters hovering over the official’s shoulder.

Several protesters donning bright green masks positioned themselves around the room as part of a demonstration by environmental groups, including the Clean Water Fund, Environment America, Public Citizen and Greenpeace. Bernhardt was nominated by Trump to lead the Department of the Interior in February after former secretary Ryan Zinke resigned amid several ethics investigations.

But Bernhardt has faced many of the same criticisms lobbed at both Zinke and former Environmental Protection Agency Administrator Scott Pruitt. Bernhardt is a former oil and gas lobbyist who has been touted as a political workhorse behind conservative environmental policies.

Greenpeace said it helped arranged the monsters on Thursday in protest of Bernhardt’s history of working “to help corporate polluters get their hands on public lands.”

“Trump campaigned hard on the idea of ‘draining the swamp,’” Greenpeace wrote on Twitter. “As we know, he’s done the exact opposite — and Bernhardt might be the most blatant example of that. We don’t call him a walking conflict of interest for nothing.”