Mike Pompeo is the last surviving member of President Trump’s original national-security team. Pompeo entered the Administration as the director of the C.I.A., but, after the sudden end of Rex Tillerson’s tenure as Secretary of State, Pompeo was elevated to the position of America’s top diplomat. All this despite the fact that Pompeo had no diplomatic experience, a résumé that includes exaggerations, and a history of criticizing Trump. Since the 2016 election, though, Pompeo has rebranded himself as a strong advocate for the President, and has come to embrace Trumpism alongside many other former critics in his party. Susan B. Glasser joins Eric Lach to discuss Pompeo’s journey from traditional California Republican to staunch Trump ally, and what it says about larger trends within the Republican Party.