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Chairman and CEO of US oil and gas corporation ExxonMobil, Rex Tillerson, speaks during the 2015 Oil and Money conference in central London on October 7.

Chairman and CEO of US oil and gas corporation ExxonMobil, Rex Tillerson, speaks during the 2015 Oil and Money conference in central London on October 7.

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Rex Tillerson concerns top Republicans

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Rex Tillerson concerns top Republicans

Some top Republicans are expressing concern over ExxonMobil CEO Rex Tillerson who many believe will be Donald Trump's pick for secretary of state. CNN's Sunlen Serfaty reports.

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Some top Republicans are expressing concern over ExxonMobil CEO Rex Tillerson who many believe will be Donald Trump's pick for secretary of state. CNN's Sunlen Serfaty reports.