HARDtalk’s Stephen Sackur speaks to Isaias Medina, former Venezuelan diplomat at the UN and now an anti-Maduro dissident. Venezuela's political and economic crisis is precariously poised - the Maduro regime is determined to re-write the constitution to strengthen its grip on power - the opposition is intent on using mass protest to bring the Government down. The current standoff isn’t sustainable, but which side will prevail? Can Maduro outlast his enemies?