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US President Donald Trump has announced he fired his hard-line National Security Adviser John Bolton, saying he disagreed "strongly" with him.

However, Mr Bolton has insisted he quit his post.

The former adviser had disagreed with the president on a number of foreign policy challenges from Afghanistan to Iran.

Mr Bolton, who had served since April 2018, was Mr Trump's third national security adviser after Michael Flynn and HR McMaster.

Emily Maitlis is joined by The Atlantic's David Frum and Jenna Ellis Rives from the Trump 2020 Advisory Board.