Rex Tillerson, Donald Trump's pick for Secretary of State, endured nine hours of questioning from senators on day one of his confirmation hearing.

The former CEO of Exxon Mobile said it was fair assumption that Vladimir Putin was behind the US election hack, but he was also challenged on his views about sanctions against Russia.

The BBC's Rajini Vaidyanathan assesses what we learned about the oilman hoping to be America's top diplomat.

Video by Franz Strasser.