What's acceptable opposition to Trump on the right?

I've never seen a political party fall in line so thoroughly than the current republicans to Trump. It seems anyone who disagrees on anything gets sidelined, attacked and forced out.

To me a diversity of ideas competing against each other creates the best robust policy. Where is the diversity of ideas coming from in the Republicans?

Are there examples of Trump tolerating differing opinions? Tell me about the different wings of the party and how they are complementing each other, this I hope will make me more confident that 4 years of Trump won't be a clusterfuck.