(FILES) This file photo taken on October 7, 2015 shows Chairman and CEO of US oil and gas corporation ExxonMobil, Rex Tillerson, during the 2015 Oil and Money conference in central London. ExxonMobil President and CEO Rex Tillerson is President-elect Donald Trump's likely pick for secretary of state, US media reported December 10, 2016, with some lawmakers quickly voicing concerns about his ties to Russian leader Vladimir Putin.Tillerson, 64, has extensive experience in international negotiations, overseeing his oil company's activities in more than 50 countries. / AFP PHOTO / BEN STANSALL