WARSAW—A top Polish court will rule on Tuesday on whether the country’s constitution or European Union treaties take precedence, the first of two rulings this week that could bring Warsaw’s conflict with Brussels over the rule of law to a head. Warsaw aims to hit back at what it says is unjustified interference in its internal affairs by the European Commission, but critics say that questioning the primacy of EU law undermines the functioning of the bloc and jeopardises Poland’s continued membership. Poland is embroiled in a long-running dispute with the EU over judicial reforms that critics say undermine the independence of the judiciary, but which the ruling nationalist Law and Justice (PiS) party say are needed to make courts function more effectively and remove a residue of communist influence. Poland says the reforms are an internal matter. “We have seen in recent years that EU bodies such as the …