Sen. John Cornyn (R-TX): $3.5M From Oil and Gas Donors, Then a Last-Minute Tax Break for Pipeline Companies

Over more than two decades in the U.S. Senate, John Cornyn (R-TX) built one of the most documented patterns of alignment between energy industry campaign money and energy-friendly legislating in Texas congressional history. The senator accepted more than $3.5 million in oil and gas industry campaign contributions across his career, received more pipeline company donations in 2018 than any other sitting senator, and in December 2017 inserted a last-minute provision into the Tax Cuts and Jobs Act that preserved preferential tax treatment for oil and gas pipeline investors — an amendment introduced hours before the bill’s passage while his former chief of staff was being paid to lobby for a pipeline company on that exact issue.

Cornyn lost the Texas Republican primary to state Attorney General Ken Paxton on May 26, 2026. He remains in office until his term expires in January 2027.

The Donors: A Career Built on Energy Industry Money

Campaign finance records compiled by the Texas Observer and OpenSecrets show that the oil and gas industry gave Cornyn more than $3.5 million over the course of his Senate career. In 2018 alone, pipeline companies contributed nearly $80,000 to his campaign — more than to any other U.S. senator that year.

The contributions continued into his final campaign cycle. E&E News reporting on Federal Election Commission filings found that Cornyn raised at least $220,000 from oil and gas sector donors in 2025. Named contributors in FEC records include ConocoPhillips CEO Ryan Lance ($7,000), Kinder Morgan executive chair Richard Kinder ($7,000), his wife Nancy Kinder ($7,000), and Energy Transfer chairman Kelcy Warren ($6,800). Corporate PACs affiliated with Halliburton, ConocoPhillips, and Koch Industries also contributed.

Donor access extended beyond direct contributions. Between 2013 and 2014, lobbyist-bundlers raised approximately $1.1 million for Cornyn — about one in every nine dollars he raised during that period, according to the Center for Public Integrity’s analysis of federal disclosure data. Koch Industries lobbyist Brian Henneberry alone bundled $109,000.

The Legislation: A Tax Break Inserted at Midnight

The most directly documented instance of donor-aligned legislating in Cornyn’s record involves the Tax Cuts and Jobs Act of 2017.

On November 30, 2017, just hours before the Senate passed the bill on December 2, Cornyn inserted a provision ensuring that investors in Master Limited Partnerships (MLPs) — investment vehicles used predominantly by oil and gas pipeline corporations — retained a 20 percent deduction on pass-through income. Without the amendment, MLP investments would have become comparatively less attractive after the bill’s corporate tax rate cuts took effect. The amendment preserved the industry’s longstanding preferential tax position.

The timing coincided precisely with an active lobbying campaign. Russell Thomasson had served as Cornyn’s chief of staff from 2013 to 2015 before transitioning to lobbying firm Cassidy & Associates. In 2017, Thomasson was registered to lobby for Loews Corporation — parent company of Boardwalk Pipeline Partners — specifically on the “natural gas pipeline tax issue.” Federal lobbying disclosure records show Loews paid $20,000 per quarter throughout 2017 for that work.

Energy Transfer, one of the largest pipeline companies in the United States with approximately 140,000 miles of pipelines, also had a stake in the outcome. Energy Transfer’s chairman Kelcy Warren gave more than $1.5 million to conservative super PACs in 2016. According to International Business Times reporting, Valero and Energy Transfer were among Cornyn’s top donors in 2016.

Cornyn’s office did not disclose the provision as a separate amendment or schedule a vote on it independently.

The Votes: A Consistent Anti-Environment Record

Cornyn’s voting record on energy and environmental legislation reflects the same priorities as his donor list. The League of Conservation Voters, which tracks votes on air quality, water protections, climate policy, and public lands, gives Cornyn a lifetime score of 6% on its National Environmental Scorecard. In 2024, he recorded 0 pro-environment votes out of 8 measures the LCV tracked.

In August 2022, Cornyn voted against the Inflation Reduction Act (Senate Roll Call Vote #325, August 7, 2022) — the largest single federal climate and clean energy investment in U.S. history, providing $369 billion for provisions including clean energy tax credits, methane emissions limits, and environmental justice programs. The bill passed 51-50, with Vice President Kamala Harris casting the deciding vote; all 50 Senate Republicans, including Cornyn, voted no.

In 2025, the LCV tracked Cornyn voting against: rolling back the federal methane pollution fee, blocking states from enforcing cleaner car standards, blocking states from setting cleaner truck standards, removing public lands protections on culturally and ecologically significant landscapes, and reversing protections that had prevented oil drilling in the Arctic National Wildlife Refuge.

Speaking to oil and gas executives at an industry summit in Tyler, Texas, Cornyn characterized supporters of clean energy policy as being part of “the cult, or religion, of renewable energy,” and described federal clean energy investments as “the Green New Deal wearing other clothes.”

The Cost to Constituents

The 2017 tax law delivered broad benefits to the energy industry, but independent reporting documents that the windfall did not flow to workers. According to Texas Observer reporting, 17 major oil and gas corporations — mostly Texas-based — received a combined estimated $25 billion benefit from the tax cuts. ConocoPhillips and Phillips 66, both among Cornyn’s donor base, publicly stated that the cuts had “no effect on employee wages, bonuses, or investment plans.” Collectively, the companies invested approximately $9 billion of the windfall in stock buybacks that benefited executives and shareholders.

The Inflation Reduction Act that Cornyn voted against included clean energy tax credits projected to reduce average household electricity costs and create jobs in clean manufacturing. Texas, with its large geography and significant renewable energy capacity, stood to receive among the largest shares of new investment under the law.

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