May is expected to say that the threat from both rogue states and terrorist groups justifies the country's nuclear program, The Telegraph reported on Sunday.
The newspaper added that she was expected to say that abandoning Trident would be a "reckless gamble."
The Trident system is deployed at the UK Royal Navy’s Faslane submarine base in Scotland. The UK Conservative Party has been campaigning to renew the nuclear deterrent despite rising maintenance costs.
The total estimated cost of renewing Trident is 167 billion pounds ($244 billion) over the 32-year lifespan of the system, between 2028 and 2060, according to the International Monetary Fund.