They might try to stop them by non lethal methods at first, but rest assured, they try to infiltrate en mass, and its not gonna go well for them.
National security DEMANDS that they be removed by lethal force if necessary.
Are they that stupid to try it? We shall see.
The best thing would be that a big group of patriots go and confront them..violently if needed.
I want to see the Israeli skunk spray come out.
Maybe DHS figures Antifa already stinks too bad to notice.