This week, an order from President Donald Trump put a halt to Singapore-based Broadcom Corp.’s bid for San Diego-based Qualcomm Inc., which was slated to be the largest tech deal of all time.

Trump’s order followed a Monday opinion from the Committee on Foreign Investment in the United States (CFIUS), which is led by U.S. Treasury Secretary Steven Mnuchin, and investigates the national security implications of foreign investments in U.S. companies. The interagency group concluded that Broadcom’s takeover of semiconductor and telecommunications company Qualcomm posed a threat to American national security.