“I will be working with you, with Steve, with the Breitbart crew,” Mr Gorka said during an interview on SiriusXM with Breitbart editor Matthew Boyle.
Mr Bannon, a self-proclaimed “nationalist”, returned as executive chairman of Breitbart less than a day after he was ousted from the White House earlier this month.
Mr Gorka announced on Friday that he was resigning from his position as special assistant to Donald Trump, although a White House official disputed the report and said Mr Gorka did not resign.
“Sebastian Gorka did not resign, but I can confirm he no longer works at the White House,” the official said.
“[G]iven recent events, it is clear to me that forces that do not support the MAGA [Make America Great Again] promise are – for now – ascendant within the White House,” Mr Gorka reportedly wrote in a resignation letter published by The Federalist. “As a result, the best and most effective way I can support you, Mr President, is from outside the People’s House.”
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In an interview with Breitbart News Daily three days before the violence in Charlottesville, Mr Gorka accused the media of focusing too much on white supremacists.
“It’s this constant, ‘Oh, it’s the white man. It’s the white supremacists. That’s the problem.’ No, it isn’t, Maggie Haberman,” Mr Gorka said, referring to the prominent New York Times reporter.
“Go to Sinjar. Go to the Middle East and tell me what the real problem is today. Go to Manchester,” he added, suggesting that the real threat to the US is radical Islamic terror.
A US citizen born in Britain with Hungarian parents, Mr Gorka worked as national security editor at Breitbart, where he frequently warned of Islamist terrorism.
The news website, which Mr Bannon has called a “platform for the alt-right”, has recently increased its attacks on the Trump administration, particularly Mr Trump’s decision to carry on the US’s involvement in Afghanistan. Mr Bannon and Mr Gorka were said to have opposed an escalation of the 16-year-old conflict.