Last week, Poland’s constitutional court ruled that Polish laws have supremacy over those of the EU in areas where they clash. There are concerns that the country could now effectively could be forced into a “Polexit” out of the EU as it is no longer playing by the bloc’s rules. On Sunday, large demonstrations in support of Polish EU membership took place across Poland and abroad, a sign of Poles’ enthusiasm for the European project. We spoke to Laurent Pech, head of the law and politics department at Middlesex University in London. He called last week’s bombshell court decision “a nuclear strike on the EU legal order”.