Bannon had been given the authority to participate in National Security Council Principals Committee meetings after Trump signed an executive memorandum in January. At the time, some experts called the move an "unprecedented" political appointment to the panel.
The former Breitbart News executive had no objections to the decision, a source familiar with the decision told ABC News.
"He was there to babysit [former National Security Adviser Michael] Flynn, to watch him as he 'de-operationalized' the NSC from [Obama-era National Security Adviser Susan] Rice," the source said. "Mission done."
Flynn was forced to resign from his position in February after he admitted to misleading Trump administration officials on the nature of multiple phone calls with the Russian ambassador to the United States prior to Trump's inauguration.
This is a developing story. Please check back for updates.
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