“…Trump quickly withdrew US support for the Trans-Pacific Partnership (TTP) after assuming 1 For a general overview of the importance of leaders, see, e.g., , Chiozza and Goemans (2004), Smith (2004, 2008), Goemans et al (2009), Stanley (2009), Stanley and Sawyer (2009), Debs and Goemans (2010), , Bang et al (2012), or Wolford (2012. 2 Leaders are not the only actors in a political system affecting the process of treaty ratification.…”