This chapter begins by noting that, on winning the 2015 General Election, David Cameron named Theresa May as a possible successor. On 12 May 2016, the Immigration Act that focuses on ‘illegal migration’ and accompanying punitive measures, came into force. Like other facets of the ‘really hostile environment’, the Act will impact on all migrants. The Referendum to decide whether the UK should stay in or leave the European Union was held on 23 June 2016, following a four-month campaign, with Theresa May and David Cameron joining the Remain camp. Shortly after May became Prime Minister, she returned to her familiar theme of reducing net migration to the tens of thousands. In late January 2017, Theresa May visited the new US president Donald J. Trump in Washington. Criticising this visit a few months later at his Liberal Democratic Party’s Conference, Tim Farron laid into Theresa May who he noted ‘took office claiming she would be a social justice crusader.