Green groups and blue states won't be the only challengers lining up to fight the Trump administration'scontroversial revisions to the legal basis for curbing mercury and air toxics from power plants.Legal experts also expect many of the operators that are subject to EPA's Mercury and Air Toxics Standards tooppose the agency's effort to undermine requirements that companies complied with years ago. Other firms thatoppose the restrictions may use EPA's reconsideration of its finding that it is "appropriate and necessary" to setthose limits as grounds to ask a court to overturn the standard, which the Trump administration has said it wouldpreserve.
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