President Donald Trump made the promise to “build a wall” between the United States and Mexico a staple of his 2016 presidential campaign. And since his election, a key part of the Trump Administration’s executive agenda has been to fulfill that promise. But after failing to receive the desired funding for the wall’s construction, the President now seeks to proceed “with or without Congress.” Usurping congressional authority, the President has declared the situation at the southern border a “national emergency” that “requires the use of the Armed Forces, triggering statutory emergency powers that allow him to redirect defense funds for “military construction” to use for construction of the wall. In doing so, Trump has abused his executive authority to further his policy goals and poached Congress’s power of the purse. A citizen coalition has since challenged President Trump’s reprogramming plan, but the Supreme Court will allow it to go into effect, pending appeal.