WASHINGTON (Reuters) - U.S. President Donald Trump warned Democrats on Sunday that Obamacare was in trouble and would die without government funding, apparently referring to the possibility of ending federal subsidies to help lower-income people buy health insurance. “Obamacare is in serious trouble. The Dems need big money to keep it going - otherwise it dies far sooner than anyone would have thought,” Trump said in a Twitter post. Republicans want to repeal the 2010 Affordable Care Act but have not agreed on a replacement. 