Britain's Prime Minister Theresa May speaks at the Conservative Spring Forum in Cardiff, Friday March 17, 2017. British Prime Minister Theresa May on Thursday rejected a call for a referendum on Scottish independence before Britain leaves the European Union — a move condemned as a "democratic outrage" by Scotland's nationalist leader. (Stefan Rousseau/PA via AP)

Britain's Prime Minister Theresa May speaks at the Conservative Spring Forum in Cardiff, Friday March 17, 2017. British Prime Minister Theresa May on Thursday rejected a call for a referendum on Scottish independence before Britain leaves the European Union — a move condemned as a "democratic outrage" by Scotland's nationalist leader. (Stefan Rousseau/PA via AP)