Doubts over the Fed's commitment to bringing down inflation have percolated for months, as investors have wavered in their conviction the central bank will press ahead in the face of a slowdown.
But the Fed and its officials have stressed they are determined to address the highest inflation in almost four decades. Mary Daly of the San Francisco branch this week said she was sceptical the central bank would cut rates next year.
"The worst thing you can have as a business or a consumer is to have rates go up and then come rapidly down," she said in an interview with CNN. "It just causes a lot of caution and uncertainty."
She said it would be wrong to think of a "large, hump-shaped rate path, where we'll ratchet up really rapidly this year and then cut aggressively next year".
Also this week, St Louis Fed president James Bullard said he supported a third consecutive 0.75 percentage point rate rise at the central bank's next policy meeting in September.
Despite such protestations, equity investors are sceptical the Fed will follow through with sharp interest rate rises.
When the Fed embarked on an aggressive tightening cycle in March, US stocks fell into bear market territory as investors bet that higher borrowing costs would hurt companies and consumers.
But the blue-chip S&P 500 and the tech-heavy Nasdaq Composite have since June recovered nearly half of their losses this year.
"There's this disconnect between the market and the Fed, and there's this idea that the Fed is going to have to relent in its tightening programme to allow for weaker employment and slowing growth," said Gregory Whiteley, a portfolio manager at DoubleLine. "That idea is really strongly embedded in markets."
The recovery in stocks has eased financial conditions, making it easier for companies to borrow and hampering the Fed's efforts to cool down the economy.
A Goldman Sachs index shows that US financial conditions have eased significantly since peaking in mid-June after the Fed's first 0.75 percentage point rate increase.
Written by: Kate Duguid, Colby Smith
© Financial Times