White House adviser Sebastian Gorka, who was closely aligned with a nationalist faction led by ousted senior strategist Steve Bannon, no longer works for President Donald Trump, the White House has said.

"Sebastian Gorka did not resign, but I can confirm he no longer works at the White House," a White House official said in a statement.

The official did not elaborate, but the statement suggested that Mr Gorka had been fired.

Mr Gorka had reportedly feuded with national security adviser General HR McMaster and was unhappy with the decision Mr Trump announced this week - backed by General McMaster and the US military - to reorient US policy in Afghanistan.

Mr Gorka, who frequently appeared on cable news shows to tout Mr Trump's policies, was a divisive figure within the administration, seen by veteran intelligence professionals and diplomats as an ideologue with little real-world experience.

He is the latest in a string of hawkish or nationalist advisers to leave the National Security Council and other parts of the White House in recent weeks, suggesting that in the battle among Mr Trump's foreign policy advisers, internationalist voices such as those of General McMaster, Defense Secretary Jim Mattis and Secretary of State Rex Tillerson are prevailing.

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Earlier, the conservative Federalist news outlet, citing multiple sources familiar with the situation, said Mr Gorka, hired as a counter-terrorism expert, had quit. In a letter of resignation, Mr Gorka expressed dissatisfaction with the current state of the Trump administration, the Federalist said.

"As a result, the best and most effective way I can support you, Mr. President, is from outside the People's House," Mr Gorka was quoted as saying in the letter.

Mr Trump fired Mr Bannon a week ago in the latest White House shake-up, removing a far-right architect of his 2016 election victory and a driving force behind his nationalist and anti-globalisation agenda.

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"Regrettably, outside of yourself, the individuals who most embodied and represented the policies that will 'Make America Great Again' have been internally countered, systematically removed, or undermined in recent months. This was made patently obvious as I read the text of your speech on Afghanistan this week," Mr Gorka said in the letter.

A US citizen born in Britain with Hungarian parents, Mr Gorka worked as national security editor at Mr Bannon's Breitbart news website, where he often warned of Islamist terrorism.