Russian curlers say a coach on their team has told them that mixed doubles bronze medalist Alexander Krushelnitsky tested positive for a banned substance.
Companies selling some of the most lucrative prescription painkillers funneled millions to advocacy groups.
Students are taking hold of the gun debate after the Florida school shooting by organizing school walkouts across the country and a march in Washington.
"The myth of invincibility of Israel, of the Israeli military, has crumbled," Foreign Minister Mohammad Javad Zarif told NBC News in an exclusive interview.
While Trump has emphasized that his campaign did not collude with Russia, he has never condemned Russia since his inauguration and lawmakers are concerned.