Markets dove into the red after President Trump said he will impose more tariffs on select countries. Tesla (TSLA) closed as the biggest laggard in the SPX after Elon Musk said he would start an "America Party," widening the divide between himself and Trump. Netflix (NFLX) traded lower after getting a downgrade from Seaport Research, while CoreWeave (CRWV) and Core Scientific (CORZ) sold off after reaching a merger deal. Marley Kayden takes investors through the biggest stories of the trading day.