Stock markets experienced volatility in response to diverging remarks from President Trump regarding the Iran peace deal and Fed Chair Kevin Warsh hinting at a shift in policy at the Federal Reserve. The uncertainty led to fluctuations in market indices, with the Dow Jones dropping by 100 points before recovering slightly, while the S&P 500 and Nasdaq also saw fluctuations throughout the day. This reaction highlights the sensitivity of markets to geopolitical tensions and potential changes in monetary policy.