We will finally complete the biometric entry-exit visa tracking system which we need desperately. For years Congress has required biometric entry-exit visa tracking systems, but it has never been completed. The politicians are all talk, no action, never happens. Never happens.
In other words, in the same way that mass incarceration surged because of a real thing, it's finally starting to ebb because of a real thing: the actual, concrete decline in violent crime that started in the early 90s and which appears to be permanent. America is simply a safer place than it used to be, and looks set to stay that way.