"G$3 iven recent events, it is clear to me that forces that do not support the MAGA promise are―for now―ascendant within the White House", Gorka said in his resignation letter first obtained by The Federalist.
Gorka's departure comes about a month after retired Gen. John Kelly took over as chief of staff, looking to instill order in a chaotic White House beset by internal divisions, staff infighting and a storm of controversies.
He also strongly refuted the allegation of former White House official Sebastian Gorka on the absence of word "radical Islamic terrorism" in Trump's Afghan policy speech.
Several White House officials have told CNN Gorka was forced out of the administration.
Secretary of State Rex Tillerson on Sunday blasted Sebastian Gorka for criticizing President Donald Trump's foreign policy goals, declaring the ex-national security aide is "completely wrong".
"Sebastian Gorka did not resign, but I can confirm he no longer works at the White House", Reuters quoted a White House official saying.
Mexico Travel Warning Updated; Cancun, Los Cabos Included
Officials added that there's no evidence that US citizens are being targeted exclusively based on their nationality, however. The Mexican government is providing resources to combat the violence and protect its $20 billion tourism industry.
Bannon was removed from his permanent seat on the council in April, and several officials who came to the council under fired national security adviser Michael Flynn were also dismissed in recent weeks, including retired Col. Derek Harvey and the council's senior director of intelligence, Ezra Cohen-Watnick.
Richard Painter, former chief White House ethics lawyer for President George W Bush, tweeted: "Gorka: Probably the most stupid of the alt-right in the White House". Gorka had worked on issues related to counter terrorism, Qatar crisis, designing new security strategy for US.
Meanwhile Mr Gary Cohn, a prominent Jewish member of Mr Trump's administration, seriously considered resigning and even drafted a letter of resignation after the deadly violence over a rally led by white nationalists, according to two people familiar with the draft.
In an interview with the Economist published on Friday, Bannon said that Breitbart, which he has called a "platform for the alt-right", would never betray Trump, but would hold the president's feet to the fire if he deviates from his campaign promises.
Gorka spoke to Matt Boyle on Breitbart News Saturday yesterday and talked about how the message that got President Trump elected is being undermined by others within the White House.