David Rothkopf is visiting professor at Columbia University's School of International and Public Affairs and visiting scholar at the Carnegie Endowment for International Peace. His latest book is The Great Questions of Tomorrow. He has been a longtime contributor to Foreign Policy and was CEO and editor of the FP Group from 2012 to May 2017.
TOPSHOT - Security guards flank Presumptive Republican presidential nominee Donald Trump (C) as he delivers a speech as he officially opens his Trump Turnberry hotel and golf resort in Turnberry, Scotland on June 24, 2016.
Donald Trump hailed Britain's vote to leave the EU as "fantastic" shortly after arriving in Scotland on Friday for his first international trip since becoming the presumptive Republican presidential nominee. / AFP / OLI SCARFF (Photo credit should read )