WASHINGTON (Reuters) - U.S. President Donald Trump on Monday declared Obamacare “dead” and “gone,” but urged Republicans and Democrats in Congress to craft a short-term fix of healthcare markets under the 7-year-old law that critics say he has effectively sabotaged. “It’s dead. It’s gone. It’s no longer - you shouldn’t even mention. It’s gone,” Trump said of former Democratic President Barack Obama’s signature 2010 healthcare law that Republicans have repeatedly tried and failed to repeal.