many years ago, the federal government, or the congress, passed a law requiring uniform emissions standards nationwide. but, now, that part, might be considered part of their pre-emption. this is the federal government's prerogative, so therefore, they can legislate and the states cannot. but they created a unique carve-out. at the time, california had a lot of smog problems and unique problems to that state, in terms of pollution. so they had this carve-out. and california was allowed to legislate and create a higher standard, which is not that unusual. and there's more. states that adopted california's exact standards were allowed to adopt those. so you created a kind of patch work quilt. >> inconsistent. >> of emissions standards. so now that's what the administration is saying they are going back to that, and saying that california's regulation dis -- >>. no more carve-outs. >> right. california's regulations violate the idea of pre-emption, and they create this unequal standard nationwide, and they're looking to essentially