Two days after 2016 Brussels bombings , former head of MI6 Richard Dearlove suggested that UK 's security would be improved by leaving the EU , arguing that leaving the EU would enable Britain to dump the European Convention on Human Rights and have greater control over immigration from EU . Although Home Secretary Theresa May cited European Arrest Warrant as a reason for her backing the Remain campaign , Dearlove argued that the importance of European Arrest Warrant was exclusively related to crime
2016 Brussels bombings
2016 Brussels bombings
Issues in the 2016 United Kingdom European Union membership referendum