U.K. Digital Secretary Nadine Dorries asked the Competition and Markets Authority to look into both the deal’s impact on competition and national security. NVIDIA has agreed to buy Cambridge-based Arm, Britain’s largest technology firm, from Japan’s Softbank.

Arm’s semiconductor technology is widely used in computing devices, including smartphones, cars and other equipment that connects to the internet. While many of the devices that use Arm technology aren’t considered critical, the government is concerned about the “security and resiliency” of the broader supply chain, the Department for Digital, Culture, Media & Sport said in a statement.