NewsWare's Trade Talk: Tuesday, September 23

S&P futures are flat as investors await flash PMI data for signs of economic momentum and a key speech from Fed Chair Jerome Powell this afternoon. Markets remain cautious with elevated tech valuations, led by Nvidia’s AI rally. Meanwhile, President Trump and HHS Director RFK Jr. stirred controversy with unproven claims about Tylenol and autism, and Trump is set to address the U.N. on U.S. foreign policy. On the earnings front, MU, AIR, and MLKN report after the bell.