Just to be clear—I am in favor of stopping all travel in and out of the US.
But, we should not kid ourselves—it is too late now.
The main reason to stop all travel is that we are spreading it around the world—and so the travel stop would have to be reciprocal—a win win.
I hope I am being clear, I am not only talking about international travel, but interstate travel. We have to do both at this point.