If the case proceeds as scheduled, the EPA will have to produce research to back Pruitt's claims about climate change.
The EPA secretary set up a call with the fast-food chain's top executive last year for a "business opportunity."
"There must be 60 hotels in Washington. I don't believe the mattresses in the Trump hotel are any better. This is just weird," Richard Painter said.
The president said the agency chief's "bold actions" had led to the threats.
The EPA chief, who is facing ethics violation allegations, has reportedly been eyeing the role for months.
Pruitt has had a “consistent disregard for transparency from the time he was attorney general to his time as EPA administrator,” the leader of a watchdog group said.
Powerful polluters want the Trump administration to make coal ash great again, and they are about to make it happen.
Lobbyists with the energy sector have pushed the EPA to scrap the Obama-era water rules for months.
The agency is gutting research focused on such products.
Meanwhile, EPA Admin Scott Pruitt racked up $90,000 in travel bills last June alone.
Scott Pruitt, head of the Environmental Protection Agency, cares much more about his next political office than he does about melting ice caps or ozone levels.
Advocacy groups have accused the Environmental Protection Agency administrator of "thwarting meaningful public participation."
New Jersey Senator Cory Booker asked EPA Admin Scott Pruitt about the proposal in a hearing on Tuesday.
The EPA has been posting signs with images of Trump and Scott Pruitt that brag about deregulation. Employees say it feels like a slap in the face.
Pruitt's actions provide a glimpse into what he means by "environmental stewardship."
Many of the vacated positions remain unfilled.
Pruitt wanted to "promote fresh perspectives."
Pruitt referred to an unrelated verse from the Book of Joshua to explain his removal of EPA funded scientists from the agency's advisory boards.
Scott Pruitt wants to end Obama’s “war on coal.” But Americans care about climate change, worry how it will affect their lives, and think the Clean Power Act was a pretty great idea.
Conway had taken flights with Tom Price, who resigned as Health and Human Services secretary amid reports on the subject.
The Associated Press' retorted that the EPA was not on site at toxic chemical dumps around Houston, Texas.
Environmentalists must ensure that Trump’s agencies follow proper legal procedures before suspending or revoking these regulations.