Pres. Obama greatly misused the executive powers to his own ends when Congress did not help out with legislation such as DACA. Pres. Trump, I agree should not have done so with legislative authority specific to the wall. Just as the executive orders of Pres. Obama were rescinded when Pres. Trump came into office, so to will these executive actions be rescinded when he leaves office. This is the real problem with a dysfunctional legislative branch. Just as Congress is lazy with legislating rules and regulations and leaving this to the Executive Branch, the Presidents re often taking the easy route of ignoring working with the legislature.
@Azorica in #30 This is a national security issue. You are wandering into other areas which are not the same. Greenhouse gases 'could' be an emergency. But you would still need related programs to shuffle the budgeted / appropriates funds between.