HARDtalk: Vicente Fox on Donald Trump and the Mexico Wall

Stephen Sackur speaks to former Mexico president Vicente Fox, whose strongly worded Twitter responses to Donald Trump have caused a storm on social media. The new US president has wasted little time delivering on his signature campaign promises. He has already ordered the construction of the contentious wall along the US-Mexican border. The US congress will fund it but, ultimately, Mr Trump says, Mexico must pay for it. Can Mexico afford to provoke the new US administration?