The system IS rigged

But not the way Trump imagines. See this article for the details. The bullet points follow:

1. You have to register to vote
2. Election Day is a work day
3. Gerrymandering and geography
4. Many felons can’t vote. 
5. Voter suppression.

6. No Instant Runoff
7. The Senate
8. You can’t vote for the Federal Reserve
9. Corporate America is more powerful than politicians