"He goes on TV - and the president likes that - and attacks the media, but it's not clear exactly what his role is", he continued.
Earlier Saturday, Trump provided reassurances about the emergency response to the hurricane, tweeting that he was "closely monitoring" the situation from Camp David as the storm dumps torrents of rain on Texas and leaves hundreds of thousands of people without power.
The news, which came late Friday evening, was widely expected in the West Wing, which has now seen high-profile departures on successive Fridays for several weeks.
'This was more or less going to be a done deal when Bannon submitted his resignation, ' an unnamed source close to the White House told The Federalist.
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"Sebastian Gorka did not resign, but I can confirm he no longer works at the White House", Reuters quoted a White House official saying.
The unflappable Englishman was seen in many quarters as the President's most ardent defender, going on a litany of news outlets both in the U.S. and United Kingdom to answer questions on behalf of the Trump administration.
On Saturday, the Axios website described him as "a bombastic White House aide known only to cable-news viewers", although his British accent also became familiar to watchers of the BBC.
Gorka's departure from the White House comes just a week after the ouster of chief strategist Steve Bannon preceded by appointment of his new Chief of Staff John Kelly.
Sebastian Gorka, now former deputy assistant to President Donald Trump, was sacked on Friday - or was he? But he operated outside of the National Security Council and his exact responsibilities were not clearly outlined, though he was a prominent advocate for Trump on television news. He made a number of warnings about Islamic terrorism while at Breitbart. Gorka attracted an extraordinary amount of scrutiny during his time in the White House for his alleged tie to a far-right Hungarian nationalist group and his questionable national security résumé.