Nellie Ohr, who worked for Fusion GPS and whose husband was a high ranking DOJ official who passed her information on to the FBI admitted that she was rooting for Hillary Clinton in the 2016 election and that she would not have been comfortable doing opposition research against her.
That information was false by the way. So, she admitted that she had a motive for feeding fake information to the FBI. She also admitted that one of her sources for the dossier was Serhiy Leshchenko. Serhiy Leshchenko is under investigation in Ukraine for interfering in the 2016 elections in the United States.
They have him on tape saying that he did so to help Hillary win the election.