Trump should get his tech team searching for her frequency then jam it.
The only problem is that I think the law makes it illegal to jam lawful communications. I’d hate to have Obama’s FCC starting an investigation as that will take news time away from Trump.
Now if the communications are being transmitted the clear, I think you may be able to rebroadcast them. Imagine during the debate the Trump campaign tweets out a link to Hillary’s ear piece feed. Allowing everyone to hear what Hillary is being fed.