CBO:

Federal debt held by the public, which was equal to 39 percent of gross domestic product (GDP) at the end of fiscal year 2008, has already risen to 75 percent of GDP in the wake of a financial crisis and a recession. In CBO’s projections, that debt rises to 86 percent of GDP in 2026 and to 141 percent in 2046—exceeding the historical peak of 106 percent that occurred just after World War II.
The prospect of such large debt poses substantial risks for the nation and presents policymakers with significant challenges.