Bank of America strategist Michael Hartnett warns bond investors as the United States approaches a national debt level of $40 trillion, arguing that current conditions raise risks for bond portfolios. The warning is tied to the scale of ongoing federal deficits and their implications for government borrowing and interest-rate dynamics.

The outlets reporting the story focus on the same central point: large and persistent U.S. budget deficits are contributing to the growth of national debt, and that trajectory can affect expectations for Treasury supply and future yields. While Fortune presents the warning as a caution for bond investors, Yahoo News repeats the headline framing without adding additional details in the provided text. Across the reporting, the emphasis remains on Hartnett’s view rather than on any specific trade, target, or change in bond-market behavior.