Louisiana’s Republican leaders, including Gov. Jeff Landry and Attorney General Liz Murrill, have supported the lawsuits even as they endorsed President Trump’s “energy dominance” agenda, leading to sharp criticism from the political right. At stake, potentially, are billions of dollars in damages that could be used to restore wetlands and forestall further erosion. In April, a jury awarded Plaquemines Parish near New Orleans, the state’s southernmost parish, $745 million in one of the cases.