Qualcomm deal over as Trump blocks Singaporean chip maker's bid

President points to national security concerns in announcing unusual move, amid climate of economic protectionismDonald Trump took the unusual step of blocking the Singaporean chip maker Broadcom’s bid for its US rival Qualcomm on Monday night, citing national security concerns and ending what would have been the biggest-ever tech deal.Announcing the extraordinary move, Trump said “there is credible evidence” that allowing the Singapore-based company to take control of Qualcomm