https://www.reuters.com/article/us-arm-holdings-m-a-nvidia-britain/uk-invokes-national-security-to-investigate-nvidias-arm-deal-idUSKBN2C61GM

LONDON (Reuters) -The UK government will look into the national security implications of U.S. group Nvidia's purchase of British chip designer ARM Holdings, it said on Monday, raising a question mark over the $40 billion deal.