ExxonMobil CEO Rex Tillerson

Sources: Trump to pick ExxonMobil CEO Tillerson as secretary of state

Like Trump, Tillerson, 64, has no formal foreign policy experience, but has built close relationships with many world leaders by closing massive deals across Eurasia and the Middle East on behalf of the world's largest energy company.

Tillerson was originally a dark horse for the secretary of state nomination, but emerged from a lengthy public interview and vetting process that included better-known quantities like former New York Mayor Rudy Giuliani, 2012 GOP nominee Mitt Romney and Sen. Bob Corker, chairman of the Senate Foreign Relations committee.