Federal Reserve Chairman Jerome Powell, and Federal Reserve Nominee, Kevin Warsh. Reuters When the Federal Open Market Committee gathers again in mid-June, it will mark the first time in nearly 80 years that a sitting and former chair conduct business together, a historic overlap that comes at a sensitive time for the central bank. While the scenario could look something like the clash of the policy titans, the meeting with the incoming Chair Kevin Warsh and outgoing Jerome Powell likely will be less antagonistic — though still carrying high stakes for policy. "Both Kevin and Jay will be able to interact, and I think the rest of the FOMC will be able to interact, although I grant that it may be challenging," said Loretta Mester, who served as Cleveland Fed president until 2024 and knows what happens behind the doors of the committee meetings well.…