Trump has on and Hillary has one. Thick transmitter and wire because they network is not trying to hide them.
My hangup was having the transmitter in the small of Crooked's back. VRWCarea51's remarks have persuaded me that this is not an unusual stage arrangement. And some other poster (sorry, whoever you are, I forget your handle) pointed out that a covert receiver arrangement would not have printed like that.
So, at this point, I think what is printing through the back of her coat is a mic transmitter.