SAN FRANCISCO (Reuters) - California Attorney General Xavier Becerra said on Friday that he will lead a coalition of states suing to prevent President Donald Trump from ending Obamacare subsidies to health insurers that help low-income people pay out-of-pocket medical expenses. California will be joined by Kentucky, Massachusetts, Connecticut and other states, Becerra, a Democrat, told reporters. The lawsuit appears to be separate to a similar effort led by New York Attorney General Eric Schneiderman. 