Not to be argumentative, but I see it a little different.
The illegals are here to swamp us. That’s what our elected officials want. They saturate us with people who don’t understand our system, and game them to oppose solid citizens.
The al Qaeda/Muslim Brotherhood types are brought over by normal legal immigration, and through pseudo ‘refugee’ situations, by manipulation.
They have swamped us with tens of millions of other people from foreign lands who don’t get our founding principles too. We have been swamped by this.
All of this is destructive.