WASHINGTON — Several prominent activists in the “Make America Healthy Again” movement are urging President Donald Trump to fire Lee Zeldin, the administrator of the Environmental Protection Agency, over his decisions to loosen restrictions on harmful chemicals.

In a petition circulated on social media, the activists wrote that Zeldin “has prioritized the interests of chemical corporations over the well-being of American families and children.”

The petition was a remarkable rebuke of the EPA chief from allies of another Cabinet member, Robert F. Kennedy Jr., the health secretary and the chief architect of the MAHA movement. It underscored growing tensions within Trump’s political base over the chemicals in the nation’s air, water and food supply.

As of early Friday afternoon, more than 2

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