A day after the former Starbucks chief Howard Schultz said he might run independently for US president, a heckler at a book launch in Manhattan shouted at him: 'Don't help elect Trump.' Schultz has faced fierce criticism from Democrats who say his candidacy may help Donald Trump win re-election in 2020. 'Go back to Davos with the rest of the billionaire elite who think they know how to run the world,' the heckler added before being pulled aside by security