https://www.reuters.com/article/us-qualcomm-m-a-broadcom-merger/u-s-says-broadcom-review-confirms-security-concerns-idUSKCN1GO1Q4 >The U.S. Treasury Department has told Singapore-based Broadcom Ltd that it has confirmed national security concerns about the chipmaker's unsolicited bid to buy rival Qualcomm Inc and accused it of violating an order to give sufficient notice of plans to move to the United States.