Bannon was relieved of his duties on the NSC on Wednesday.

On Thursday, Trump met the Chinese leader, Xi, in Mar-a-lago. That night, he approved the mission to bomb the airfield in Syria.

When did Trump make his decision? Did Bannon disagree with him? Is that why he was let go off the National Security Council?

Had Trump made his decision before the "gassing" in Syria?

Did the tragedy give him an opportunity and an excuse to do it Thursday night?

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In a move that was widely seen as a sign of changing fortunes, Mr. Trump removed Mr. Bannon, his chief strategist, from the National Security Council’s cabinet-level “principals committee” on Wednesday. The shift was orchestrated by Lt. Gen. H. R. McMaster, Mr. Trump’s national security adviser, who insisted on purging a political adviser from the Situation Room where decisions about war and peace are made.

Mr. Bannon resisted the move, even threatening at one point to quit if it went forward, according to a White House official who, like others, insisted on anonymity to discuss internal deliberations. Mr. Bannon’s camp denied that he had threatened to resign and spent the day spreading the word that the shift was a natural evolution, not a signal of any diminution of his outsize influence.

https://www.nytimes.com/2017/04/05/us/politics/national-security-council-stephen-bannon.html?_r=0