The reason why Romney needs to shut up is because he is putting the country in greater danger... how? Because in my opinion Trump makes this country more safe real time challenging what Obama is currently doing. Romney is just changing the subject from things like Obama’s administration’s current day by day handling of refugees to “Trump still hasn’t released his taxes”... Basically Romeny’s stupidness is putting this country in danger as he talks (real time).
By Trump calling Obama out ‘real time’, Trump is making the country more safe (real time as in ‘right now’).