Pollution laws and regulations

FILE - In this March 16, 2017, file photo, proposals for the Environmental Protection Agency (EPA) in President Donald Trump's first budget are displayed at the Government Printing Office in Washington. President Donald Trump will sign an executive order on March 29 that will suspend, rescind, or flag for review more than half-a-dozen measures that were part of former President Barack Obama’s sweeping plan to curb global warming. (AP Photo/J. Scott Applewhite, file)

FILE - In this March 16, 2017, file photo, proposals for the Environmental Protection Agency (EPA) in President Donald Trump's first budget are displayed at the Government Printing Office in Washington. President Donald Trump will sign an executive order on March 29 that will suspend, rescind, or flag for review more than half-a-dozen measures that were part of former President Barack Obama’s sweeping plan to curb global warming. (AP Photo/J. Scott Applewhite, file)

FILE - In this dec. 4, 2009 file picture, flags with the Opel logo are seen in front of the Opel headquarter in Ruesselsheim, central Germany. Slogan read: We live cars. French investigators say they have found evidence of possible emissions fraud in Fiat, Renault, Peugeot-Citroen and Volkswagen cars sold in France, but have found no proof of fraud in Opel vehicles. (AP Photo/Michael Probst, File)

FILE - In this May 13, 2014, file photo National Education Association staff members from Washington joining students, parents and educators at a rally at the Supreme Court in Washington on the 60th anniversary Brown v. Board of Education decision that struck down "separate but equal" laws that kept schools segregated. From the time Americans roll out of bed in the morning until they turn in, and even who they might be spending the night with, the court's rulings are woven into daily life in ways large and small. (AP Photo)

FILE - This Feb. 14, 2013, file photo, shows the logo on the grill of a Volkswagen on display in Pittsburgh. On Friday, March 10, 2017, Volkswagen is expected to plead guilty to three criminal counts at a morning hearing in Detroit federal court for cheating on diesel emissions tests. (AP Photo/Gene J. Puskar, File)

FILE - This Feb. 14, 2013, file photo, shows the logo on the grill of a Volkswagen on display in Pittsburgh. On Friday, March 10, 2017, Volkswagen is expected to plead guilty to three criminal counts at a morning hearing in Detroit federal court for cheating on diesel emissions tests. (AP Photo/Gene J. Puskar, File)

FILE- In this March 6, 2016 file photo, Donald Trump drives himself around the golf course to watch the final round of the Cadillac Championship golf tournament in Doral, Fla. President Donald Trump's executive order seeking to rewrite a rule that protects small streams from pollution raises new questions about financial conflicts of interest for a president whose business holdings include a dozen U.S. golf courses. It's not clear whether any financial benefits from more lax regulation of waterways on golf courses could violate laws meant to keep politicians from using public office for personal gain, but experts say it adds to an appearance of impropriety.(AP Photo/Luis Alvarez, File)