Is he right?
Partly I think. One thing the temporary ban has done is explode and expose the hysterical reaction of the Trump haters. All Trump is doing is following Obama with actions he set in motion. The 7 countries chosen were chosen by the Obama admin. Trump is also forcing congress to engage and do their job (while exposing RINO's in the process.)
Some decent people will be adversely affected, but that's true anytime you try to solve a problem that's been allowed to fester. To the left, Trump is Hitler no matter what he does.