Just more proof of the petty, vindictive, and autocratic tendencies of President Dump. Trump only likes people that fluff him on daily basis.
https://edition.cnn.com/2018/08/15/politics/john-brennan-security-clearance/index.html

John O. Brennan
✔@JohnBrennan
"This action is part of a broader effort by Mr. Trump to suppress freedom of speech & punish critics. It should gravely worry all Americans, including intelligence professionals, about the cost of speaking out. My principles are worth far more than clearances. I will not relent."
https://edition.cnn.com/2018/08/15/politics/john-brennan-security-clearance/index.html

John O. Brennan
✔@JohnBrennan
"This action is part of a broader effort by Mr. Trump to suppress freedom of speech & punish critics. It should gravely worry all Americans, including intelligence professionals, about the cost of speaking out. My principles are worth far more than clearances. I will not relent."