ICE Union: ‘Thousands of Illegal Aliens Are Being Released into U.S.’ with ‘Catch and Release in Overdrive’

https://www.breitbart.com/politics/2019/03/13/ice-union-thousands-of-illegal-aliens-are-being-released-into-u-s-with-catch-and-release-in-overdrive/

I don't understand, why is POTUS allowing this catch and release nonsense to continue? What can he do about it and why hasn't he stopped it?