Trump had one major legislative accomplishment, if you want to call it an accomplishment: The Tax Cuts and Jobs Act he signed into law in December 2017. It has an enormous cost: Although Republican leaders claimed it would generate growth and lead to “$1 trillion in additional revenue,” the Congressional Budget Office estimated that it would cost $1.9 trillion before the tax cuts expired in 2025. The CBO’s estimate has proven to be right on the mark. The Trump tax cut has exploded the national debt.