I predict that Preibus will be next to be thrown under the bus. After which the Trump team will declare they had absolutely no knowledge of Preibus’ activities and that he acted completely alone. And then both the Trump team and Congress will declare that there is no further need for investigation because Preibus is gone.
Pretty much the same song and dance we got when Flynn resigned under pressure.
Rewind back about 43 or 44 years. Remember all the Nixon minions who bit the dust in order to protect the President? The truth still caught up with him.