Steve Bannon has stepped down as the head of right-wing website Breitbart News.
Former White House chief strategist Steve Bannon has reaffirmed his support for President Donald Trump after the US leader attacked him.
The US president lashed out at his former chief strategist following comments he made in a new book.
The US president is losing another of his key aides in the latest of a string of high-profile departures.
The White House chief strategist's comments have attracted interest given his own much-criticised right-wing beliefs.
US President Donald Trump's chief strategist Steve Bannon has claimed he succeeded in his brief stint on the National Security Council as he issued a statement on his removal from the role.
The change came after national security adviser HR McMaster told some national security experts he felt he was in a "battle to the death" with Mr Bannon and others on the White House staff.
But Mr Bannon said in a statement he had redirected the role of the NSC back to coordinating foreign policy rather than running it - a change he blamed on Obama national security adviser, Susan Rice.
"Susan Rice operationalised the NSC during the last administration so I was put on NSC to ensure it was 'de-operationalised.' General McMaster has NSC back to its proper function," he said.