"EPA needs a lesson in separation of powers and we're asking the court to give it to them."A coalition of farming and conservation groups is calling on a federal appeals court to hold EPA chief Andrew Wheeler in contempt for defying an order to immediately suspend use of dicamba, a poisonous weed-killer that is notorious for its tendency to drift and destroy nearby crops."Trump's EPA is so rogue it thinks it can blow off a federal court ruling that stops the damaging dicamba spraying in an administrative order," George Kimbrell of the Center for Food Safety, lead counsel in the case, said in a statement late Thursday night. "