U.S. President Donald Trump has named hostage negotiator Robert O' Brien as his new national security advisor,... to replace John Bolton who was forced out after clashing with Trump on a variety of foreign policy issues.
Mr. O'Brien will be President Trump's fourth national security adviser in three years,... the most any U.S. president has had in a first term.
Kim Mok-yeon has more on Mr O'Brien.... and how he's expected to mold the administration's foreign policy at a particularly testing time.

President Trump has selected special envoy for hostage affairs at the U.S. State Department, Robert O'Brien, as his new National Security Advisor.
Taking to Twitter on Wednesday, President Trump said he was pleased to announce O'Brien had accepted the promotion.
Speaking to reporters after getting the nod, Trump praised O'Brien for doing a very successful job as a hostage negotiator, adding he believes he will continue to do well working closely with him in the White House.

"Through hostage negotiation, I got to know him very well myself but also, a lot of people that I respect, rated him as the absolute number one choice. So, you know I think we have a very good chemistry together and I think we're gonna have a great relationship. He is a very talented man."

O'Brien said it was a privilege to take on the role and he looks forward to working with President Trump in keeping America safe.

Robert O'Brien is an attorney from LA who has served as a foreign policy adviser to several Republican presidential campaigns.
He previously served in several State Department positions, including as an alternative representative to the UN General Assembly in 2005.
He will be Trump's fourth national security advisor, replacing John Bolton, who the president fired last week.
Trump said he and Bolton strongly disagreed on a number of foreign policy issues, including on North Korea and Venezuela.
As Trump's top adviser on national security, O'Brien will be tasked with tackling everything from immigration policy, heightened tensions with Iran and will also influence Washington's next moves in its stalled denuclearization talks with North Korea.
Kim Mok-yeon, Arirang News.