Trump engages in U.S. healthcare battle, breakthrough possible

By Steve Holland and David MorganWASHINGTON (Reuters) - In a possible breakthrough for U.S. Republicans' chaotic effort to roll back Obamacare, three moderate lawmakers emerged from a White House meeting with President Donald Trump on Wednesday and said a revised bill might pass.Keen to score his first major legislative win since taking office in January, Trump has been personally engaged this week in trying to cement support among fellow Republicans in the House of Representatives for an effort