That seems like wild speculation.
I think they are dropping out, because they haven’t supported Trump’s agenda, and now they won’t be able to win the primary.
Flake as much said so.
Although, it’s entirely possible that Trump has something on them and has told them either they go quietly or they go not quietly.
Most people say McCain did it. McCain is from Arizona so is Flake. Doesn’t seem too far fetched to me..