The problem, it claims, is that the application depended on «the Steele dossier,» a document put together by former British spy Christopher Steele
alleging deep ties between Trump and Russia (it's the source of, among other things, the «pee tape» rumors about Trump and Moscow prostitutes).
The dossier, as publicly released, is a series of 17 reports written over six months, based on a plethora of sources, that
allege deep and corrupt
ties between Trump and Russian officials.