Mueller subpoenas mark big new step in Trump Russia investigation
Carol Lee, NBC News national political reporter, talks with Ari Melber about Special Counsel Robert Mueller subpoenaing grand jury testimony from PR executives tied to Paul Manafort.
Butina admits being an agent of Russia, will help US prosecutors22:44
Trump inauguration finances under criminal investigation: WSJ09:08
Nadler vows accountability for Trump 'culture of corruption'08:15
Mueller rebuttal to Flynn memo to cap wild week of news01:17
Cohen beseeches court for mercy, receives 3-year prison sentence24:34
Case against Trump progeny clearer after Cohen, AMI deals07:35