President Trump on Monday unveiled a $4.8 trillion budget that the administration is touting as a serious effort to tackle the problem of rising deficits. In reality, it’s a demonstration of why the United States is fiscally doomed.

The Trump budget aims to show that the U.S. can start to get the debt under control while increasing defense spending and avoiding tax hikes or structural changes to Medicare and Social Security. It does so by promising to slow the growth of nondefense spending significantly while endorsing smaller, Obama-era reforms to Medicare and changes to Medicaid. The budget proposal leans heavily on optimistic assumptions that economic growth will remain strong and interest rates will remain low for the next decade.