Blunt ad: "President Trump is caving to ethanol lobbyists"

Beginning today, a group led by mid-sized oil refiners is running ads on Fox & Friends — a show the president is known to watch — that knock the administration for backing off changes to the national biofuels mandate called the Renewable Fuel Standard.

Why it matters: The bluntly worded, weeklong Fox ad campaign aimed right at President Trump's eyeballs signals the intensity of the fight over the RFS, a topic that pits the biofuels industry and midwestern lawmakers against the oil industry and its Capitol Hill allies.