US Treasury to buy back up to $6B in longer-term debt again tomorrow.

The point… the keyword here is LIQUIDITY. It's not about shrinking the $40T debt. These are liquidity-support buybacks where the Treasury buys older, less-liquid (less used) longer-term bonds from the market.

That gives dealers and holders a regular outlet to sell off-the-runs, which improves secondary-market liquidity and helps the overall Treasury market function smoothly.