Federal Reserve Chair Kevin Warsh is reportedly prepared to raise interest rates in September if incoming inflation data runs hot, putting investors on notice that the central bank's next move could be another increase rather than the cuts previously demanded by President Donald Trump. The prospect threatens rate-sensitive stocks, bonds and housing while making August inflation releases critical market catalysts.

Warsh would support higher rates at the Federal Open Market Committee's September meeting if forthcoming price reports show inflation remaining stubbornly elevated, the Financial Times reported, citing people familiar with his thinking. The Fed held its benchmark rate at 3.5% to 3.75% in July, although three policymakers dissented in favor of an immediate increase.

Markets reacted quickly. The probability of a quarter-point hike at the Fed's September 15-16 meeting climbed to 56.7%, according to CME FedWatch, from 54.4% a day earlier. The two-year Treasury yield rose four basis points to 4.22%, while the 10-year yield increased two basis points to 4.64%.

The renewed hawkish risk reflects inflation that remains well above the Fed's 2% target. Headline PCE inflation reached 3.7% in June, while core PCE, which excludes food and energy, was 3.3%. The next PCE report is scheduled for August 26.

Warsh is not alone. Fed Governor Lisa Cook said she would support higher rates if inflation fails to cool, while other policymakers have also signaled openness to tightening.

Investor Takeaway

The immediate tests are July CPI on August 12, producer prices on August 13, and the August employment report before September's decision. Hot inflation combined with resilient hiring would strengthen the case for a hike.

Higher rates would likely pressure richly valued technology stocks, real estate, utilities and other long-duration assets while supporting the dollar and short-term yields. Softer inflation could unwind hike expectations and revive growth stocks. Investors should also watch whether Warsh clarifies his policy framework before September, since limited guidance could keep Treasury and equity volatility elevated even if the Fed ultimately holds rates steady.