The U.S. Treasury is preparing to disclose the size of its expanded buyback program for older long-dated securities, with investors focused on whether Treasury Secretary Scott Bessent will exceed the $4 billion minimum announced in August. Market expectations center on a $5 billion to $6 billion operation, while economists warn that a $4 billion purchase could disappoint investors and renew selling pressure. Bessent defended the intervention on Tuesday, describing the recent bond-market selloff as a speculative move requiring a public-policy response and saying his objective is to restore market balance rather than determine long-term interest rates. The 10-year Treasury yield remains near its highest level since 2023, affecting U.S. mortgage rates and corporate borrowing costs. A substantially larger operation could indicate greater government concern over market instability, while Treasury maintains that the purchases are a liquidity and maturity-management measure rather than quantitative easing.