I think you may be full of poop on this one... chlorpyrifos has never been banned.
"By reversing the previous administration’s steps to ban one of the most widely used pesticides in the world, we are returning to using sound science in decision-making – rather than predetermined results," EPA Administrator Scott Pruitt said in the statement.
http://www.reuters.com/article/us-usa-pesticide-epa-idUSKBN17039F