The PM has been urged to set up a key parliamentary committee so a long-awaited report into alleged Russian interference in UK politics can be published.
The Petitions Committee called on the PM to take action after 100,000 people signed a petition on the issue.
It said there had been “extensive delays” to the appointment of the Intelligence and Security Committee.
Government sources told the BBC last month the ISC would be set up soon.
The committee is appointed by Number 10 and oversees the UK’s intelligence community.
It has been more than six months since it has met – the longest hiatus since it was established in 1994.
In a letter addressed to the prime minister, Petitions Committee chairwoman Catherine McKinnell said she was writing “to put to you