human
Session offered to resign a few weeks ago. "Sessions and the President have had a series of heated exchanges in recent weeks, prompted by the attorney general's decision to recuse himself from the probe into Russia interference in the election and alleged collusion by Trump aides, a source close to Sessions told CNN on Tuesday.  Trump's state of mind has been revealed in recent days in a series of furious tweets about the Russia investigation, the media, his demands for the courts to stop blocking his travel ban and the London terror attack." 

I think Trump believed that his administration swore an oath to protect him against investigations--and when they don't comply to his wishes--he either fires them or incessantly brow beats them about it.  At any rate Trump decided to keep Sessions on, only in an effort to not start another fire storm.
http://www.cnn.com/2017/06/07/politics/donald-trump-jeff-sessions-resignation/index.html
gpt
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