The legal basis for Judge Leon's decision is the absence of explicit authorization from Congress for the project's execution. The judge argued that Trump's claim of authority had no legal basis, leading to the immediate suspension of the works. The judge's ruling highlights the need for a clear delineation of powers between the executive and legislative branches regarding the management of federal resources.
The court's decision serves as a reminder that the president, although having extensive responsibilities, is not above the law. The project, valued at hundreds of millions of dollars, was put on hold pending a possible review and approval by Congress.