Michael Lewis, “Has Anyone Seen the President?” Bloomberg View, Feb. 9, 2018.

Matea Gold and Frances Stead Sellers, “After Working for Trump’s Campaign, British Data Firm Eyes New U. S. Government Contracts,” Washington Post, Feb. 17, 2017; Nicholas Confessore and Danny Hakim, “Data Firm Says ‘Secret Sauce’ Aided Trump; Many Scoff,” New York Times, Mar. 6, 2017; Joshua Green and Sasha Issenberg, “Inside the Trump Bunker, with Days to Go,” Bloomberg, Oct. 27, 2016.