There is the key, free money, using our own social service system against us! Halt that, and you halt the invasion. Say what you will, but he and his staff are playing one hell of a chess match.
This is a great step in the right direction. Next, let’s make it conditional on assimilation: follow laws, learn the language, understand that the culture you left behind doesn’t override the one that was here when you came, disavow terror and terrorists, etc.