Cause he would be obliterated that's why! Ol' bone spurs is running chicken.
He wouldn't be allowed to name call and avoid real questions.
He would also have to follow debate rules. Something he can't do. Plus his lies would be in the spot light.
Folks running for office should have to participate in at least 2 debates.
This is a bad precedent trump is making by not agreeing to debates for the American voters.