Nvidia shares fell 9 on Monday, erasing over $260 billion in market value. The plunge occurred as President Donald Trump confirmed 25 tariffs on Canadian and Mexican imports taking effect Tuesday. The Dow dropped 800 points, and the Nasdaq Composite slid over 3. Nvidia has lost over 13 since Wednesday despite reporting earnings that beat estimates. CFO Colette Kress said the impact of tariffs remains uncertain. The company plans to produce chips at TSMC's $100 billion U.S. expansion announced by Trump.