You don’t know what Trump wants. What you fail to understand is that Trump is going to have to deal with whoever is Speaker yet he doesn’t get to decide who that is. The House does. So think for a moment what would happen if Trump started publicly attacking Johnson and demanding he be removed and then the removal effort failed. If you don’t think an angry, spiteful Johnson could inflict even more damage, perhaps even sabotaging Trump’s presidential bid, then you’re not thinking.
But, of course, you do.