The policies I am referring to include the executive policies of the current administration on visa processing and the proposal of the current administration and it's legislative allies to reduce total legal immigration by cutting total visa alotments focussing on reductions in permitted family-based immigration, among others. These are either additional administrative barriers to or outright reductions in currently legal immigration.

This has nothing to do with debates over executive authority to choose how to prioritize enforcement and to make transparent commitments regarding that (which the executive clearly has in some cases, outside the obvious pardon power, since literally every grant of immunity from prosecution, or plea bargain to reduced charges, is an enforceable commitment by the executive not to enforce some law in some well-defined circumstance based on policy priorities.)