US Debt by President by Dollar and Percent - Obama the WORST Under President Obama, the national debt grew the most dollar-wise. He added $8.588 trillion. This 74 percent increase was the fifth-largest. Obama's budgets included the economic stimulus package. It added $831 billion by cutting taxes, extending unemployment benefits, and funding public works projects. https://www.thebalance.com/us-debt-by-president-by-dollar-and-percent-3306296