Treasury yields jump on prospect of U.S. having to refund tariff money; 30-year yield tops 4.97%

1. Treasury yields increased significantly due to legal ruling on tariffs. 2. Court ruling might lead to tariff repayments, straining U.S. fiscal situation. 3. European bond yields also rising, indicating global economic concerns. 4. Key economic data is due this week, affecting Fed's interest rate policies. 5. Potential refunds of tariffs could lead to increased Treasury issuance.