A conservative source close to the campaign told me that Trump only truly consults one person, Alabama Republican senator Jeff Sessions: “When Jeff Sessions calls, Trump listens.” (…)

Then, while in D.C. for the anti-Iran-nuclear-deal protest in September, he met privately with Sessions in the basement of the Capitol. “That was a very long meeting,” recalled Stephen Miller, then an adviser to Sessions. “They discussed immigration, taxes, welfare, the Supreme Court, and entitlements.”
Trump stayed in contact with Sessions throughout the fall and in January strengthened ties by hiring Miller to serve as his campaign’s policy adviser.