Boris Johnson spent the weekend considering whether to introduce a second coronavirus lockdown in England.
The prime minister has already announced the introduction of fines of up to £10,000 for people who flout self-isolation rules.
Watch: What lockdown breaches can you be fined for?
On Sunday, there was a backlash following reports the government will lift the rule of six for 24 hours on Christmas Day to allow families to see each other.
Health secretary Matt Hancock has said he would report a neighbour to police for breaking COVID-19 self-isolation rules.
Johnson is reportedly considering a two-week mini lockdown in England, according to the BBC.
Watch: What are the current UK government guidelines on face coverings within schools?