US Stock Market: Wall Street slips, Boeing tumbles amid US-China trade war; Dow futures down 170 points; Nvidia shares fall 6%

US-China trade war: The sharp decline in Nasdaq futures was largely attributed to Nvidia, whose shares tumbled 6% in after-hours trading. The chipmaker announced a $5.5 billion quarterly charge linked to export restrictions on its H20 graphic processing units to China and other countries, sending a wave of caution through the tech sector.