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Input: John Brennan's stint as director of the CIA  ended when President Donald Trump took office in January 2017. Since then   Brennan  has had a chance to observe and analyze Trump's behavior.
 Brennan  spoke with Business Insider US editor-in-chief Alyson Shontell at an Intersport leadership summit in April  for an episode of Business Insider's podcast  "Success! How I Did It." Shontell asked  Brennan  what  he  thought of Trump's leadership so far.
"Clearly  he  did a phenomenal job during the campaign  and I feel as though  he  believes that  his  natural instincts on these issues  whether it be in business or in campaigning  which have been very successful and can continue to drive  him .  He  is somebody who is a very spontaneous individual.  He  reacts to  his  gut.
"A lot of these issues are very  very complex and complicated  and my feeling and impression is that  he  has had only a very  very limited experience in dealing with these international issues and has very superficial understanding of issues that are very  very complicated  whether it be terrorism or North Korea or Russia  China  you name it — cyber issues. And  he  really needs to go to school on some of these issues."
 Brennan  went on to distinguish between Trump the presidential hopeful and Trump the president:
"The gut instinct  the spontaneity that got  him  through the election  that's not sufficient to deal with these issues  and missteps and mistakes on the international front  as well as on the domestic front  really can have very  very damaging locations for the country. And I was hoping that by now we would have seen an adjustment from the candidate Trump to President Trump. But I think  he  has a certain persona  and I think  he  feels as though  he 's been very successful to date  and so  he  has continued in that path.

Former CIA director John Brennan on Trump's leadership skills