Janet Yellen.Andrew Harnik/AP The Treasury Department may issue $1.6 trillion in bills over the full year, Deutsche Bank said. That's as it looks to rebuild its cash balance following the debt ceiling crisis. On Friday, just before the debt limit bill was signed, the balance was just $23.4 billion. The suspension of the US debt limit has cleared the way for the Treasury Department to refill its coffers, and a tsunami of borrowing is expected in the coming months.Congress passed a debt ceiling bill last week, and President Joe Biden signed it over the weekend.