President Joe Biden is stuck between a rock and a hard place as the United Auto Workers prepare to walk off the job in September over concerns about the nation's switch to electric vehicles.

UAW's potential strike specifically at workers at factories producing EV batteries for Ford, General Motors, and Stellantis, formerly Chrysler, the "Big Three" American auto manufacturers. Many of those factories are jointly owned by battery companies and are not currently subject to union wage and benefit standards in place at traditional auto plants.

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UAW President Shawn Fain is calling on Biden and D.C. lawmakers to amend federal incentives in Biden's Inflation Reduction Act, CHIPS and Science Act, and other spending legislation to wage and safety standards at all auto factories.

"They’re going to have to choose because we’re going to ask them, ‘Which side are you on?'" Fain said in a video outlining the union's position in early August.

Biden himself hosted Fain at the White House in July to discuss the strike. Following that meeting, a UAW spokesperson said that Fain asked Biden to show public support for the workers, though senior Biden administration officials say that the president will likely not openly discuss specific negotiating points.

Biden administration officials have also said that the president and administration leadership "agree completely that battery factory workers deserve every right to organize and negotiate for jobs that provide the pay and protections needed for economic security and economic dignity."

UAW, unlike other labor unions, has thus far held off on endorsing Biden's reelection effort, despite giving him their blessing in 2020. Failing to secure support from one of the country's largest auto-industry unions could fracture the coalition that sent Biden, the self-billed most pro-labor president in U.S. history, to the White House three years ago.

Meanwhile, former President Donald Trump, who carried Michigan in his 2016 general election victory over former Secretary of State Hillary Clinton, is openly courting votes from UAW members.

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In a video published in late July, following Biden's White House meeting with Fain, Trump attacked Biden's "ridiculous Green New Deal crusade" for allegedly abandoning autoworkers.

"I hope United Auto Workers is listening to this because I think you’d better endorse Trump," he said in the video.