Trump does this often. He'll be attacked for one thing or another and look to muddy the waters by arguing the same thing applies to someone else — usually [Hillary] Clinton. It's completely transparent in its simplicity and brazenness.

For example, poll after poll has shown that the vast majority of Americans don't view Trump as being qualified to be president. Trump's response? Argue that Clinton isn't qualified.

In fact, the morning after Clinton herself said Trump isn't qualified , on May 19, Trump basically said (to borrow another playground quote), “I am rubber and you are glue; whatever you say bounces off me and sticks to you.”

And he has kept up the attack ever since.