Why is Trump allowed to testify by tweet?

He is using an electronic media to give voice to his mendacious disinformation DURING AN IMPEACHMENT HEARING aimed directly at him!

The American people shouldn't hear a peep from him regarding his guilt or innocence, or the witnesses' credibility, or anything else even tangentially related to this hearing unless he is under oath and being interrogated by Congress. We govern there.

So come on, Donald. Whatever you have to say, say it in the People's House.