Robert O’Brien

Trump Taps Robert O’Brien for National Security Adviser

U.S. President Donald Trump faces reporters with U.S. hostage negotiator Robert O'BrienWASHINGTON (Reuters) - U.S. President Donald Trump picked U.S. hostage negotiator Robert O'Brien on Wednesday as his fourth White House national security adviser, turning to a low-key choice for the position after the boisterous tenure of John Bolton.