Roger Stone refuses to give up source on WikiLeaks

In an interview with Yahoo News Chief Investigative Correspondent Michael Isikoff, Roger Stone, one of the men at the center of the investigations into Russia's meddling in the 2016 election and a longtime friend and informal adviser to President Trump, said he will not give up his source in communication with WikiLeaks' founder, Julian Assange, if he, Stone, is called to testify before the House or Senate intelligence committees.