The US national debt has reached a new milestone, exceeding $40 trillion. This record high is attributed to various factors, including defense costs and social programs. Additionally, interest on the deficit has also played a role in the national debt surpassing this threshold.

Further details about the national debt and its implications are available from the source. The $40 trillion figure highlights the significant financial burden of the country's spending and obligations.

For more information on the national debt and its contributing factors, readers can refer to the original report, which provides a more in-depth look at the current financial situation.