I'm gonna be honest, this is a stretch. I watched the clip. Whatever he was about to say definitely sounds like it was starting with an M, not an N. The shape of his lips are closed, which you'd see with an M sound and not an N. With the context of what he's saying, it really sounds like he was trying to say "migrant" and "immigrant" at the same time.
Don't get me wrong, this dude's a dipshit for dozens of other reasons. But there's nothing here this time. This really doesn't seem to be worth any amount of energy.