Do you think he and Pence have secretly been tested? If so, I think it was probably too quickly to get a true answer, having only just been exposed. He'll have to be tested again in a week or so, especially if symptoms appear. And his breathing sounded horrible in the Oval Office Speech. If that's his baseline respiratory health, it's not great to begin with.
they have almost definitely been tested. why they're lying about it, pretending they haven't...well, we pretty much know why. but i'd be shocked if they haven't been tested. tho this admin is remarkably careless and foolish so...