Trump is following a path to the white house. Its better to be seen and not heard. With his control of the republican party, it can work as he feels that there is no need to engage his fellow republicans in debate. They are not worthy unless they kiss the Don's hand. Hopefully the Don washes his hands.
So he agrees to two debates with Joe Biden hosted by CNN and I believe NBC, Slap in the face against his republican rivals. . I guess Trump does not respect them or knows that he cannot beat them because they are mostly younger and established Republicans. They are not worthy of the DON.
So he will debate Biden. So can the most established Politian in the race put on the show one last time. Trounce Trump. Is is a tall order as he is not what he used to be. But all he has to do is let Trump make more blunders. Should be a piece of cake.