It appears that the FBI may have had a mole embedded in the Trump campaign.
'''Strassel concludes:
"I believe I know the name of the informant, but my intelligence sources did not provide it to me and refuse to confirm it. It would therefore be irresponsible to publish it.'''
https://www.zerohedge.com/news/2018-05-10/wsj-fbi-hid-mole-trump-campaign