MPs have questioned why a security review into the takeover of a Welsh company by a Chinese-owned firm has allegedly "not begun".
Prime Minister Boris Johnson last year asked national security adviser Sir Stephen Lovegrove to examine the purchase of Newport Wafer Fab by Nexperia for a reported £63 million.
The Welsh company is one of the UK's largest manufacturers of semiconductors, which are key components in communications devices and technology like smartphones.
The Commons Foreign Affairs Committee said the sale of Newport Wafer Fab to a "company with links to the Chinese Communist Party" had resulted in one of the UK's "prized assets" going to a "strategic competitor", and could potentially compromise national security.
In a report - Sovereignty For Sale: Follow-up To The Acquisition of Newport Wafer Fab - published on Tuesday, the committee's MPs questioned why the UK Government had not used powers in the National Security and Investment Act to intervene.
The Act, which came into force in January, affords ministers the right to step-in on business matters "where there is a risk to national security".
Tom Tugendhat, Tory chairman of the committee, said: "The Prime Minister's assurances that work is underway are welcome.
"However, so few details have been provided to the committee, that we are left with the unfortunate conclusion that no review has taken place.
"Today, the committee is calling on the Government to clarify the reasons why the Prime Minister requested a review in Newport Wafer Fab and why this review has not begun.
"The Government has the tools, it just needs to use them."
A Government spokesman said: "The Government is considering the case and no decisions have been made."