Dow Jones Futures: President Trump and Iran's comments sparked a tech rebound Monday. Micron, Nvidia and Sandisk were big winners.

Marvell surged on news that it'll join the S&P 500.

US Stock Market Rallies Monday as Tech Leads Rebound After Friday's Selloff: The Dow Jones Industrial Average climbed above 51,000. The S&P 500 advanced nearly 1%. The Nasdaq…