Sitting Presidents Really Don't Do Well When They're Primaried By Their Own Party Members
When a primary opponent arises and challenges a sitting president in their own party, the result is often the same.
Namely, the incumbent is weakened and ultimately loses to their opponent in the general election.
And according to Business Insider, that's why President Donald Trump should be worried.
Several centrist Republicans are weighing primary challenges against Trump in 2020.
They include Maryland Gov.
Larry Hogan and former Ohio Gov.