An Aug. 2, 2017, memo from Deputy Attorney General Rod Rosenstein appears to be the first public indication that Mueller has been OK'd to probe collusion.
Adam Edelman and Tom Winter, NBC News
Tue, 04/03/2018 - 6:44am
An Aug. 2, 2017, memo from Deputy Attorney General Rod Rosenstein appears to be the first public indication that Mueller has been OK'd to probe collusion.