@#3 ... Biden doesn't need Congress in order to enforce the border. Existing law allows for him, compels even, to do that. ...
Yeah, I've heard Republicans saying that, all without citations.
All that aside...
Pres Biden seems to be saying, ~if the American people want me to enforce the border, then let thmem express that view via Congress.~
Unfortunately for the Republicans in Congress, they do not want the border to be enforced, as I have noted hee on this most august site many times.
Pres Biden is saying that Congress represents the United States, so if Congress says to enforce the border, he will abide that particular decision.
So, the question your current alias needs to ask is why don't the Republicans in Congress want border security?
If I may, I will repeat...
Republicans like border security as an issue more than they like border security as a solution.
Your current alias' comment only enforces that opinion.