The policy-setting Federal Open Market Committee was sharply divided at its July 28-29 meeting, with three of its members opting for a rate increase. Warsh's speech at the Fed's Jackson Hole economic symposium in Wyoming last month was widely perceived as hawkish.
Taken together with a surge in crude oil futures back above $100 a barrel amid renewed escalation in the war in the Middle East, financial markets have now priced in two rate hikes by March.
Yields on the interest-rate-sensitive two-year Treasury notes have surged around 20 basis points since Warsh's Jackson Hole speech, while the yield on the 10-year Treasury note is trading close to 5%. Trump administration officials have made it clear that 5% is a line they do not want crossed.
"In my view, Chairman Warsh coming out firmly in the camp of the hawks at Jackson Hole means that a hike is probable this month unless Friday's CPI release brings a substantial downside surprise," said Stephen Stanley, chief U.S. economist at Santander.
September has been an important month for the Fed in recent years. It launched its latest easing cycle in September 2024 and resumed cutting rates last September after a roughly eight-month pause.
A separate Reuters poll on the upcoming CPI data predicted a 0.4% month-on-month rise after a 0.1% increase in July. Inflation on a year-over-year basis is expected to hold steady at 3.4%.
Inflation as measured by the Personal Consumption Expenditures Price Index remains well above the Fed's 2% target and has stayed there for more than five years. The persistence of above-target inflation is putting political pressure on President Donald Trump's fellow Republicans as they try to keep control of Congress in the midterm elections in November.
Trump, who has one of the lowest approval ratings on record in presidential opinion polls, recently threatened wide-reaching trade restrictions unless the Fed cuts rates.
Economists now forecast annual PCE inflation at 3.5% this year and 2.4% in 2027, unchanged from last month's estimates, with inflation unlikely to return to the Fed's 2% target before 2028. Unemployment is expected to remain near the 4.1% level.