U.S. Treasury yields rose in choppy trading after Federal Reserve Chairman Kevin Warsh said that the U.S. ‌central ⁠bank ⁠will "have work to do" if policymakers are not confident that underlying inflation is returning to its 2% target.The remarks made at ⁠the Fed's ‌annual Jackson Hole symposium acknowledged financial conditions ⁠do not appear restrictive and marked the closest he has come to acknowledging interest rate hikes may be needed to ease price pressures.Also Read: US Fed chairman Kevin Warsh says inflation is elevated and 'concerning' at Jackson HoleThe 2-year ‌note yield, which typically moves in step ​with Fed ​interest ⁠rate expectations, rose 5.36 basis points to 4.286%, the highest ​since July 31.The yield on benchmark U.S. 10-year notes rose 2.01 basis points to 4.692%.