The US national debt has topped $40 trillion for the first time, the Treasury Department said on Wednesday, drawing fresh warnings that a fiscal crisis is brewing as ballooning costs for social safety-net programs and interest payments far outstrip revenues held back by tax cuts.

Federal debt has mounted amid tax cuts and trillions in pandemic spending, adding to the nation's interest payments.

The national debt is now over $40 trillion, a historic high that economists warn is bad news for the United States.