It later reappeared during EU membership referendum campaigning ahead of the 2016 UK referendum on EU membership, being used to criticise the campaign being run by Britain Stronger in Europe, supporters of the UK remaining in the European Union. Former Mayor of London and key figurehead of the Leave campaign Boris Johnson re-introduced the term. He put forward claims that the pro-EU campaign was guilty of scaremongering, saying that "the agents of Project Fear" were trying to "spook" the British public into voting against British withdrawal from the European Union.