It's not bait-andswitch. It is the process by which investigators start out searching for one thing and - with unsavory characters - that one thing often leads to other things.
David Cay Johnston: "Trump Is Not A Loyal American... There Is A Traitor In The White House"
http://paxonbothhouses.blogspot.com/2018/07/david-cay-johnston-trump-is-not-loyal.html