WASHINGTON — The U.S. Senate on Thursday rejected Democrats’ attempt to overturn a controversial Trump administration power plant regulation. Sen. Kyrsten Sinema was one of three Democrats who sided with the Republicans. “Kyrsten voted against repealing the Affordable Clean Energy plan today for the same reason she voted against repealing the Clean Power Plan in 2015. Senate Democrats sought to force their Republican colleagues to go on the record backing a Trump rule that critics say falls short of what’s needed to combat climate change. The law allows Congress to overturn federal agencies’ regulations within 60 days after a rule is finalized.