President Trump announced Robert C. O'Brien will be appointed the next national security adviser on social media Wednesday morning.

O'Brien, the current special presidential envoy for hostage affairs at the State Department, will be replacing John Bolton. Bolton was relieved of duty recently after disagreeing with Trump on policy.

Before his current position working with families of American hostages, O'Brien served as the co-chairman of the U.S. Department of State Public-Private Partnership for Justice Reform in Afghanistan under Secretaries Condoleezza Rice and Hillary Clinton, according to his State Department biography.

I am pleased to announce that I will name Robert C. O’Brien, currently serving as the very successful Special Presidential Envoy for Hostage Affairs at the State Department, as our new National Security Advisor. I have worked long & hard with Robert. He will do a great job! — Donald J. Trump (@realDonaldTrump) September 18, 2019

O’Brien served on the foreign policy and national security advisory team for 2012 Republican presidential nominee Mitt Romney. He went on to serve as a foreign policy and national security adviser for former Gov. Scott Walker, R-Wisconsin, in 2015.

O'Brien and former federal Judge Stephen Larson in 2016 founded Larson O'Brien LLP, a law firm based in Los Angeles.

Trump considered O’Brien for Navy secretary in 2017, but he instead appointed him to the State Department position.

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