Letting the sun shine in – for a while: why (most) US presidents embrace openness

Most US politicians with ambitions to shake up the status quo say they want more openness in government – though many of them go off the idea after they acquire power. Donald Trump, however, is not interested in either open government or the usual nods to transparency that presidential candidates offer. But as he is discovering, secrecy in politics attracts suspicion, writes Ben Worthy.