U.S. Treasury Secretary Scott Bessent will hold a press conference Monday at 2 p.m. ET (1800 GMT) at the Treasury Department, after saying this week that he would provide details of planned sanctions against Iran. The event follows President Donald Trump’s warning of economic consequences for any country providing "any type of lifeline to Iran." It also comes as the Treasury adopts a more aggressive pace of buybacks of longer-term government debt. Treasury support measures announced Wednesday for long-duration bonds briefly helped restrain rising yields, but most of the decline had reversed by Friday. Long-term Treasury yields have recently risen on concerns over the U.S. government’s growing debt, inflation remaining above the Federal Reserve’s 2% target and possible effects on investment flows.