https://www.reuters.com/article/us-qualcomm-m-a-broadcom-merger/president-trump-halts-broadcom-takeover-of-qualcomm-idUSKCN1GO1Q4 >U.S. President Donald Trump issued an order on Monday prohibiting semiconductor maker Broadcom Ltd's proposed takeover of Qualcomm Inc on grounds of national security, bringing an end to what would have been the technology industry's biggest deal ever.