Reuters: The U.S. Interior Department said on Monday it will try to overturn a Bush administration rule that made it easier for coal mining companies to dump mountaintop debris into valley streams. Calling the rule “bad policy,” Interior Secretary Ken Salazar said he will ask the Justice Department to go to the courts to withdraw the Bush regulation and send it back to Interior to stop the policy. Salazar said the Bush-era rule allowed coal mine operators to use “the cheapest and most …