Marco Rubio actually said...

Hope is no substitute for rigorous empirical real-world testing.

I think that is a prudent course of action, to proceed cautiously and to go forward on a sort of test drive of this new process and make sur...

If this thing goes off the rails, if, in fact, it's used in a nefarious way, what leverage do we have to pull back on it?

it's not about not giving it up at some point. It is about whether we do it the right way