There is no doubt that there will be a primary challenger if Trump runs in 2020. Question is whether it will make a difference.
Trump will crush a GOPe primary challenge. What these dopes do not understand is people are sick of politicians and the GOP is dead without Trump and Dems are dying too. Bernie was the anti-politician candidate too, just ideologically 180 from Trump
These politicians are full of themselves so maybe a 2018 and 2020 round of Primaries is what they need to have some butt hurt