Donald Trump: We must work together to save Americans from Obamacare

US President Donald Trump has warned that the nation's health care system is in danger of imploding and said Congress must make fundamental changes to the sweeping health law passed by his predecessor.

President Trump said at a White House meeting with dozens of governors that he hoped to overhaul the American tax system, but that was a "tiny little ant" compared to what he would need to do to remake the so-called Obamacare law.