One night in September 2014, when he was chief executive of Breitbart News, Stephen Bannon hosted cocktails and dinner at the Washington townhouse where he lived, a mansion near the Supreme Court that he liked to call the Breitbart Embassy. Beneath elaborate chandeliers and flanked by gold drapes and stately oil paintings, Jeff Sessions, then a senator from Alabama, sat next to the guest of honor: Nigel Farage, the insurgent British politician, who first met Sessions two years earlier when Bannon introduced them. Farage was building support for his right-wing party by complaining in the British press about “uncontrolled mass immigration.” Sessions, like other attendees, was celebrating the recent collapse in Congress of bipartisan immigration reform, which would have provided a path to citizenship for some undocumented people. At the dinner, Sessions told a writer for Vice, Reid Cherlin, that Bannon’s site was instrumental in defeating the measure. Sessions read Breitbart almost every day, he explained, because it was “putting out cutting-edge information.”