An ING analyst said the Federal Reserve’s upcoming policy decision could test the U.S. dollar’s resilience to falling oil prices after the United States and Iran reached a temporary peace agreement.

According to Jin10, ING’s Francesco Pesole wrote in a report that even if the Fed keeps interest rates unchanged on Wednesday, markets will still look for confirmation that policymakers—especially new Fed Chair Kevin Warsh—remain open to future rate hikes.

Pesole said the dollar could face heavy selling if signals from Warsh or the broader Federal Open Market Committee differ clearly from what markets have priced in.

He added that removing any perceived bias toward policy easing should be enough to support the dollar.