It was the foundation for the O Admin to continue to spy on Trump after he was elected. Rosenstein also was one of those that submitted the shady FISA warrant to the judge. They all assumed that it would be used to remove him. The Dems cannot have Rosenstein removed as they have to have an O guy in that position to prevent the lot of them from being prosecuted. They have to keep Trump tied down with the threat of Obstruction of Justice to save their own butts, which is the whole reason for the Russia! Bologna and the special prosecutor.
That IG report that comes out in April will be extremely important.