A bipartisan deal to speed energy development is facing concerns it could favor natural gas over renewables because of President Trump's opposition to wind and solar.

Why it matters: The worries from Rep. Sean Casten (D-Ill.) could complicate efforts to pass the bill before year's end, highlighting divisions even among Democrats who have long supported permitting reform.

Driving the news: Casten, a former energy executive and leading Democratic voice on permitting reform, said he isn't yet backing the bill and is negotiating changes with Senate Democrats to prevent it from disproportionately benefiting natural gas.

"My test for the bill is: I talk to energy developers, and ask, 'What would you build in response to this bill?' And the answer I get overwhelmingly is a lot of gas," Casten told Axios on stage at a University of Chicago event Wednesday.

"I think you have to look at the bill in the context of everything else that the Trump administration has done."

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