Sen. Kay HaganKay Ruthven HaganInfighting grips Nevada Democrats ahead of midterms Democrats, GOP face crowded primaries as party leaders lose control Biden's gun control push poses danger for midterms MORE (D-N.C.) introduced amendment 3095, which passed on a 54-41 vote. She said the military’s reliance on oil subjects it to price shocks.

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The federal government aids the development of advanced biofuels with $510 million of funding through the Defense Production Act. The act, which includes an industry match, aims to reduce the military’s dependence on foreign oil by strengthening the domestic fuel industry.

Hagan said the Defense Production Act is essential for developing a domestic energy industry that could unchain the military from oil and make budgeting more predictable.

“Cost overruns could force the military to curtail training and less urgent operations — resulting in increased risk to future missions. Developing a commercially viable biofuels industry could help DOD diversify its fuel sources and reduce the risk of energy volatility,” Hagan said on the floor Thursday.

The biofuels the Defense Production Act supports are made from non-edible feedstocks, such as algae and switchgrass. Advocates say those fuels could provide a sustainable way to power the nation’s vehicle fleet.

But those fuels have not reached commercial scale, and many lawmakers are calling on the government to abandon the technology.

Production of advanced biofuels has barely made a dent in targets established in the Energy Independence and Security Act of 2007. That has made the fuels, and the mandate that promotes their production, the subject of criticism from the petroleum industry and lawmakers on both sides of the aisle.

The biofuels community says the global recession stunted investment in those technologies. It contends advanced refineries are just now starting to reach commercial production levels.

Agriculture Department support has been key for scaling up those refineries. Agriculture has devoted funding and research to biofuels through other programs as a way to create rural jobs.

Still, some Republican senators said the military should not be a venture capitalist for energy technologies. Sen. James InhofeJames (Jim) Mountain InhofeOvernight Defense: Biden participates in NATO summit | White House backs 2002 AUMF repeal | Top general says no plans for airstrikes to help Afghan forces after withdrawal Top Republican proposes leaving 1,000 US troops in Afghanistan into next year The Hill's Morning Report - Presented by Citizens' Climate Lobby - Biden floats infrastructure, tax concessions to GOP MORE (R-Okla.) said such spending deserves greater scrutiny with $500 billion of defense cuts slated for the next 10 years as part of sequestration.

“[The Navy’s] operation and readiness funds are stretched to a maximum,” Inhofe said. “If you keep giving out a 100 million dollars here and there, that’s coming out of our readiness.”

Republican Sens. Susan CollinsSusan Margaret CollinsSenate confirms Radhika Fox to lead EPA's water office Pelosi says she's giving Senate more time on Jan. 6 commission Overnight Energy: Schumer to trigger reconciliation process Wednesday | Bipartisan bill would ban 'forever chemicals' in cosmetics | Biden admin eyes step toward Trump-era proposal for uranium reserve MORE (Maine), Chuck GrassleyChuck GrassleyOn The Money: Yellen, Powell brush off inflation fears | Fed keeps rates steady, upgrades growth projections Overnight Health Care: US buying additional 200M Moderna vaccine doses | CureVac's COVID-19 vaccine failed in preliminary trial results | Grassley meets with House Dems on drug prices Grassley meets with moderate House Democrats on lowering drug prices MORE (Iowa), Mike JohannsMichael (Mike) Owen JohannsMeet the Democratic sleeper candidate gunning for Senate in Nebraska Farmers, tax incentives can ease the pain of a smaller farm bill Lobbying World MORE (Neb.) and Dick Lugar (Ind.) voted with Democrats for the amendment, while Sen. Jim Webb (D-Va.) opposed the amendment.

The Senate also passed an amendment requiring the Veterans Administration to create a plan on how to deal with its backlog of veterans’ claims. Sen. John CornynJohn CornynHouse approves Juneteenth holiday, sends bill to Biden's desk Cornyn calls GOP lawmaker's position against Juneteenth 'kooky' Senate on collision course over Trump DOJ subpoenas MORE (R-Texas) introduced amendment 3158 and it passed on a 95-0 vote.

The Senate is schedule to continue amendment work on the National Defense Authorization Act, S. 3254, on Thursday, with hopes of finishing work by the end of the week. The defense bill funds U.S. military operations.