The Remain campaign argued that only a minority of UK law derives from the EU and that Britain retains a veto in many key areas. In addition, PM Cameron’s negotiation deal allows national parliaments to block EU legislation. argued that the pooling of sovereignty was necessary to enable fair trade across the EU. The Leave campaign meanwhile austria rcs data argued that the British government has repeatedly been defeated in cases brought to the European Court of Justice (ECJ) and that leaving the EU was the only way to regain full sovereignty
Security
The UK is not part of the Schengen Area[3] and therefore does not have open borders. Thus the Remain campaign argued Europol membership and the sharing of intelligence helps to combat cross-border crime and that the European Arrest Warrant in particular has returned thousands of criminals to justice in the UK. The Leave campaign refuted this claim stating that the supremacy of EU law makes it harder to deport criminals and that post-Brexit the UK would still cooperate with EU member states to address terrorism.
Economy
The Remain campaign argued that leaving the EU would cause an economic shock and that growth in the UK economy would be slower. In addition, the UK would still have to apply EU rules in order to have access to the single market. The Leave campaign contested this by stating that UK companies would be exempt from the encumbrance of EU regulation and would be able to negotiate trade deals bilaterally with other countries.