Susan Rice “unmasked” surveillance records for hundreds of Americans, and recent reports indicate that FBI put an informant into the Trump campaign:

. . .the important thing is that the Obama administration infiltrated the Trump campaign with a spy. That’s the important thing. Who it is, we will eventually learn, but we don’t need to know who it is to know what the FBI did. and when I say the FBI, I mean the Obama administration, they infiltrated the Trump campaign with a spy. And while they have that spy implanted, they were unmasking and leaking and obtaining FISA spying warrants and conducting criminal investigations of Trump advisers.
https://www.realclearpolitics.com/video/2018/05/11/rush_limbaugh_why_did_obamas_fbi_place_an_informant_inside_trump_campaign.html