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The Guardian - US
The Guardian - US
World
Dharna Noor

US senator calls on big oil to disclose suspected lobbying over Trump plan to axe key climate rule

emissions rise from a smokestack
An oil refinery in Houston, Texas, on 29 August 2025. Photograph: Ronaldo Schemidt/AFP via Getty Images

In the wake of the Trump administration’s announcement that it will overturn the rule which underpins virtually all US climate regulations, a Senate committee has launched an investigation into a suspected lobbying push that led to the move.

On Tuesday, the Senate environment and public works committee sent letters to two dozen corporations, including oil giants, thinktanks, law firms and trade associations. The missives request each company to turn over documents regarding the 2009 declaration, known as the endangerment finding, which the Environmental Protection Agency (EPA) said in July that it will unmake.

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