Heavy borrowing, increased spending and tax cuts by Democratic and Republican administrations have long raised concern.

The federal debt reached $40 trillion as the government adds red ink at a rapid rate. That's leading nervous investors to demand higher interest rates —pushing up borrowing costs…

The United States is digging itself into an ever-deeper debt hole.

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