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The President of US, Donald Trump has named a new national security adviser to replace John Bolton.

Robert O'Brien has had a long career in foreign policy working for both main US parties and currently heads hostage negotiations at the State Department.


He is Mr Trump's fourth national security adviser of his presidency.

1As top adviser on national security, Mr O'Brien will be tasked with tackling everything from immigration policy to heightened tensions with Iran.

"I have worked long & hard with Robert. He will do a great job!" Mr Trump said in his tweet announcing Mr O'Brien's selection.

He follows Mr Bolton, HR McMaster and Michael Flynn in the role, which does not require confirmation by Congress.