All Trump has to say is,”Joe are your handlers feeding you these bad answers through that earpiece? If so, you need better handlers.”
Media will go into a major cycle:
First, Biden issues denials. Media says what a mean liar Trump is.
Next they’ll have “guests” admit that it’s a hearing aid; Trump is bashing the elderly and handicapped.
Then proof oozes out that Biden really was receiving answers.
Rather than disrupt the transmission, Trump should have them intercepted and recorded. Once the trap is set, play them alongside debate recordings of Biden.
Oh, I LIKE that! Make sure that ALL pre-debate testing and mic-checking is recorded as well.
Of course, the Dems will say that it was added post-debate by Trump's team and never happened.