While Coburn's language would completely eliminate the subsidy, the pro-ethanol proposal would cut off the subsidy on July 1, and replace it with a variable subsidy that fluctuates with the price of oil. Proponents of the bill, like Sen. Richard Lugar (R-Ind.), said the variable subsidy bill would help guard against attempts by oil producers to lower the price of oil in order to drive the ethanol industry out of business.

"The proposal acts as a safety net to prevent OPEC from manipulating oil prices to kill off their ethanol rival," Lugar said. "When oil prices are high, as they are today, corn-based ethanol would not receive subsidy payments."

Under this proposal, ethanol blenders would get no subsidy at all when oil prices are above $90 a barrel. If oil falls to between $80 and $90 a barrel, they would get a six cents per gallon subsidy. Another six cents would be added for each $10 drop in the price of oil, and a maximum subsidy of 30 cents a gallon could be received when oil falls to $50 a barrel or less (a summary of the bill is here).

That's still less than the current 45 cents a gallon subsidy that ethanol blenders receive currently, regardless of the price of oil.

Proponents of the bill say ending the current system on July 1 and moving to a variable subsidy would save $2.5 billion. In a nod to Coburn and his supporters, the bill would use $1 billion of that for deficit reduction.

The rest would be used for the variable subsidy, but also for the development of ethanol infrastructure and other incentives. For example, the bill would expand tax credits to ethanol blender pumps, and extend through 2014 the small producer ethanol credit.

The bill is sponsored by Sen. John ThuneJohn Randolph ThuneFlake to try to force vote on DACA stopgap plan Congress punts fight over Dreamers to March The 14 GOP senators who voted against Trump’s immigration framework MORE (R-SD), who said Monday that senators should oppose Coburn's attempt to immediately cut off all subsidies to ethanol without warning.

"What the amendment our colleagues are trying to get a vote on tomorrow would do is basically to say to this industry: Yes, we are going to take away this particular tax incentive, and we are going to do it right in the middle of the year," Thune said. "We are going to do it, and we do not like this industry -- which is probably what animates a lot of the opposition to this because if people look at the facts, if they look at the contribution that biofuels have made to our fuel supply in this country, it is significant."

"This bill would transition to a more sustainable model of support for renewable fuel production in America instead of pulling the rug out from under an industry, with 4 days' notice, that employs hundreds of thousands of people in this country, as well as provides an alternative to oil," said Sen. Amy KlobucharAmy Jean KlobucharOvernight Health Care: Trump eases rules on insurance outside ObamaCare | HHS office on religious rights gets 300 complaints in a month | GOP chair eyes opioid bill vote by Memorial Day Overnight Regulation: Trump to take steps to ban bump stocks | Trump eases rules on insurance sold outside of ObamaCare | FCC to officially rescind net neutrality Thursday | Obama EPA chief: Reg rollback won't stand Dems seek reversal of nursing home regulatory rollback MORE (D-Minn.), another sponsor.

Other sponsors are Sens. Dan CoatsDaniel (Dan) Ray CoatsTop state election official questions why Trump is downplaying threat of Russian election interference: report Russian bots turn to gun control after Florida high school shooting: report The case alleging Russian collusion is not closed MORE (R-Ind.), Richard DurbinRichard (Dick) Joseph DurbinAmerica’s waning commitment to the promise of the First Amendment Senate rejects Trump immigration plan What to watch for in the Senate immigration votes MORE (D-Ill.), Al FrankenAlan (Al) Stuart FrankenShould the Rob Porter outcome set the standard? Grassley, Dems step up battle over judicial nominees Sen. Gillibrand, eyeing 2020 bid, rankles some Democrats MORE (D-Minn.), Charles GrassleyCharles (Chuck) Ernest GrassleyPavlich: The claim Trump let the mentally ill get guns is a lie Congress fails miserably: For Asian-Americans, immigration proposals are personal attacks Grassley, Dems step up battle over judicial nominees MORE (R-Iowa), Tom HarkinThomas (Tom) Richard HarkinTrump should require federal contractors to follow the law Orrin Hatch, ‘a tough old bird,’ got a lot done in the Senate Democrats are all talk when it comes to DC statehood MORE (D-Iowa), John HoevenJohn Henry HoevenSenate Republicans call on Trump to preserve NAFTA GOP anxious with Trump on trade GOP lawmakers to Trump: Don't fire Mueller MORE (R-ND), Mike JohannsMichael (Mike) Owen JohannsFarmers, tax incentives can ease the pain of a smaller farm bill Lobbying World To buy a Swiss company, ChemChina must pass through Washington MORE (R-Neb.), Tim JohnsonTimothy (Tim) Peter JohnsonCourt ruling could be game changer for Dems in Nevada Bank lobbyists counting down to Shelby’s exit Former GOP senator endorses Clinton after Orlando shooting MORE (D-SD), Mark KirkMark Steven KirkHigh stakes as Trump heads to Hill Five things to watch for at Trump-Senate GOP meeting Giffords, Scalise highlight party differences on guns MORE (R-Ill.), Claire McCaskillClaire Conner McCaskillMcCaskill welcomes ninth grandson in a row Dem group launches M ad buy to boost vulnerable senators Senate Dems block crackdown on sanctuary cities MORE (D-Mo.), Jerry MoranGerald (Jerry) MoranFlake to try to force vote on DACA stopgap plan Congress punts fight over Dreamers to March The 14 GOP senators who voted against Trump’s immigration framework MORE (R-Kan.) and Ben Nelson (D-Neb.).