California’s attorney general said the state plans to sue the Trump administration over its repeal of Obama-era rules meant to address public safety concerns in hydraulic fracturing, or fracking, on federal lands. The federal government’s Bureau of Land Management (BLM) in 2015, under Democratic President Barack Obama, issued rules that would have required companies to provide data on chemicals used in fracking and to take steps to prevent leakage from oil and gas wells on federally-owned land. However, the rules for federal and tribal lands were never implemented because oil and gas industry groups sued to block them, arguing that they were unnecessary and would slow the country’s path to energy independence. That litigation ended when the Trump administration repealed the regulations last year.