Brexit isn't the only threat to the coherence of the European Union. Think about Hungary for a second. The populist Government of Victor Orban rejected the EU's agreed response to the external migration challenge. The prime minister held a referendum in a bid to assert Hungary's right to ignore EU rules. Other EU member states have accused Hungary of threatening the Union's future. Hardtalk’s Stephen Sackur speaks to Hungarian foreign minister, Péter Szijjártó. Why won’t Hungary play by Europe’s rules?(Photo: Hungary's Minister of External Economy and Foreign Affairs, Peter Szijjarto. Credit: Attila Kisbenedek/AFP/Getty Images)