U.S. equities diverged Monday as a selloff in memory, storage and optical-component stocks pushed the Nasdaq 100 down 1.0% to 29,015.54, while the Dow Jones Industrial Average gained 0.3% to 53,459.34. The S&P 500 slipped 0.1% to 7,664.26 and the Russell 2000 fell 0.5% to 3,001.85. President Donald Trump said in a Truth Social post that "January First, 2027, Tariffs on all Cars, Trucks, both large and small, Automotive Parts, and Steel, will be increased to 50%," days after reports that Washington and Ottawa were nearing a deal to halve the existing 50% levy on Canadian steel and aluminum. Treasury Secretary Scott Bessent is due to speak on Iran Monday afternoon about an economic blockade. The 10-year Treasury yield eased about 4 basis points to 4.69%, while the 30-year yield fell roughly 6 basis points to 5.22%; the 10-year remained below last week's 20-month high of 4.75%. Fed Chair Kevin Warsh is scheduled to speak at Jackson Hole on Friday, while Wednesday's inflation data and Nvidia's results Wednesday evening are key events. Gold rose 1.0% to $4,654.67 an ounce, extending its one-month gain to 14.2%, and Bitcoin climbed 2.2% past $79,000. Memory and storage shares led declines, while consumer staples, financials and communication services outperformed. Crypto-linked stocks, Etsy and Cleveland-Cliffs gained, while Applied Optoelectronics, space stocks, Tempus AI and MongoDB fell.