Washington, D.C. – A federal judge in Washington will hear arguments Monday on the Bush administration's winter use plan for Yellowstone and Grand Teton National Parks. Environmental groups favor a plan written by the Clinton administration to phase out snowmobiles in favor of snowcoaches. They're asking the judge to reinstate the Clinton plan. The Bush administration plan would reduce the number of snowmobiles and require the cleanest machines. The judge doesn't have much time to issue a ruling. The snowmobiling season is scheduled to start Wednesday.