In brief: Nvidia's usually robust share price has fallen more than 2% on the back of a new report that claims the United States is considering further restrictions on the export of artificial intelligence chips to China. While the move would have the biggest impact on Nvidia, AMD also saw its share price dip. The Wall Street Journal reports that Washington is considering tightening its export controls on AI chips to China as a means of preventing US companies' top hardware from being used by or diverted to military users, finding its way into the nation's supercomputers, or being used...