President Donald Trump, yielding to pressure from farming states and agreeing to suspend changes to U.S. biofuel policy, now is being criticized by another constituency important to him — the main union for oil refinery workers.The United Steelworkers, the largest industrial union in North America representing refinery workers, said the president’s decision leaves in place a costly regulation that puts at risk thousands of the types of blue-collar jobs Trump promised to preserve.“Inaction by the Trump administration now threatens the livelihood of thousands of East Coast refinery workers and tens of thousands of related jobs throughout the Northeast,” the union said in a statement Wednesday.On Tuesday, Trump had told Midwestern lawmakers he would drop a proposal to tweak the Renewable Fuel Standard to cut costs to refineries, saying he understood the move would hurt farmers, sources familiar with the matter said.Sens.