U.S. Senator McCain says has 'concerns' about Tillerson nomination

U.S. President-elect Donald Trump's choice for Secretary of State, Rex Tillerson, will have to explain his relationship with Russian leader Vladimir Putin at his confirmation hearing, senior Republican senator John McCain said on Thursday. McCain, who is chairman of the U.S. Senate Armed Services Committee, also called President Putin "a thug and a murderer". Speaking on a tour of the Baltic states, where there is widespread concern that Moscow wants to reassert its power across the region, McCa