Any President can be found to be unfit for office.
It doesn't even have to be about incompetence, crime or ideology. It could be for health reasons, because of an emotional or mental breakdown, the result of an injury or dementia. Any sort of disability could disqualify him or her.
We cannot have a political party that does everything they can to keep him in power because they want him to shut down EPA, or dismantle Obamacare. The world now knows that the Republican Congress can be bought, and they have a good idea of what it will cost.