President Trump is appointing two businessmen, Elon Musk and Vivek Ramaswamy, to lead the new Department of Government Efficiency or DOGE. Its goal is to cut wasteful spending. Rather than adding a new bureaucracy to shrink the existing one, though, why not go for a line-item veto as the more constitutionally logical  solution — one that would ensure that the goal of fiscal responsibility endures long after Trump’s term expires.