The iShares 20+ Year Treasury Bond ETF fell to a new 20-year low on Monday as rising long-term U.S. Treasury yields continued to weigh on bond prices. TLT was down 0.80% at $81.38 at the time of publication and traded at a new 52-week low, according to Benzinga Pro data. The weakness reflects the inverse relationship between bond prices and yields, with higher rates on 20-year and 30-year Treasuries putting added pressure on long-duration debt. The sell-off has also been linked to heavy supply after large U.S. Treasury auctions, as continued issuance to finance the national deficit tests investor demand. Sticky inflation concerns, geopolitical tensions and elevated energy prices have further darkened the outlook for long-term bonds, while higher borrowing costs across global bond markets have added to the strain.