[jamaksin]

And just who determines if said duty has been abandoned?

And say, that then happening, so what.

You might recall that President Jackson, when the SCOTUS ruled against him, said (to paraphrase) ... Well let's see them enforce that ruling.

Today, in the United Stares, politics and not law rules.

[Enterprise]

Who would be qualified to say that the duty to patrol the border has been abandoned? I would start with this man:

Border Patrol Union Official Under Gag Order, Says No Agents Securing Border