Bernie Sanders says it's important to keep calling Donald Trump a liar

Opponents of Donald Trump must continue calling the US President a liar, Bernie Sanders has said. The veteran Democrat defended his use of the word after a Washington Post columnist, Amber Phillips, accused him of lowering the quality of US political discourse. 
Read more: http://www.independent.co.uk/news/world/americas/us-politics/bernie-sanders-donald-trump-liar-important-vermont-democrat-senator-us-president-a7618871.html?source=Snapzu