Trump's only path to the presidency includes outlining coherent policy, listening to expert political election advisors, and countering these type of attacks in a structured manner -- otherwise his campaign turns into nothing more than an entertaining reality show. However these are all things he has proven unable to provide. He needs to turn this around if he expects to succeed in the fall election.
Because he has captured the imagination of a vacuous reality show audience.The reality show method seems to have been the successful way to do it.