This is because they have been using it in order to intimate and blackmail the President Trump.
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That was the whole point of Comey’s initial meeting with Trump where he revealed the Russian Dossier. Like a blackmailer laying out incriminating photos before his victim, Comey thought the FBI could intimidate Trump. It didn’t work out the way Comey expected. Instead Trump was outraged.
" Comey thought the FBI could intimidate Trump. It didn’t work out the way Comey expected "
Exactly .