BORIS Johnson will chair an emergency Cobra meeting on Tuesday, September 22, to discuss the next steps in tackling the coronavirus pandemic.
It is expected the Prime Minister will announce new measures to curb the spread of Covid-19.
Cobra meetings are usually called ahead of significant restrictions being decided.
After the meeting, the PM is expected to address Parliament in the afternoon and the nation in a televised address in the evening.
When is Boris Johnson's emergency Covid Cobra meeting today?
The emergency Cobra meeting will take place in the morning on Tuesday, September 22.
It is Boris Johnson's first meeting of the Cobra emergency committee in four months and will be attended by the leaders of all four UK nations.
The Prime Minister will also address Parliament in the afternoon and is expected to do this at about 12.30pm.
In the evening, he will address the nation in a live TV broadcast at 8pm.
A Number 10 spokesperson said: "No-one underestimates the challenges the new measures will pose to many individuals and businesses.
"We know this won't be easy, but we must take further action to control the resurgence in cases of the virus and protect the NHS."
Mr Johnson and senior ministers were briefed by England's chief medical officer Professor Chris Whitty, chief scientific adviser Sir Patrick Vallance and chief economic adviser at the Treasury Clare Lombardelli at the weekend.
"The PM has been engaged with the cabinet throughout this process. The cabinet received a detailed briefing from the government's chief medical, scientific and economic advisers over the course of the weekend," his spokesman said.
"The PM will work with his colleagues to ensure that we respond in the most effective way to try to control the spread of the virus and to save lives."
The government's crisis response meetings are held in the Cabinet Office Briefing Rooms and are most commonly take place in Briefing Room A - leading to them being referred to as Cobra.
What will be discussed?
Boris Johnson has been urged to introduce new restrictions after a surge in coronavirus cases across the country.
In the meeting, the PM is expected to discuss new measures in a bid to curb the spread of Covid-19 - including a 10pm curfew for pubs, bars and restaurants.
He is also expected to emphasise the need for people to follow social distancing measures, wear face coverings and wash their hands regularly.
The hospitality sector could also be restricted by law to table service only.
According to newspaper reports, Mr Johnson will urge people to work from home where it does not negatively impact businesses.
On Monday, September 21, the coronavirus alert was increased from three to four, meaning the transmission of Covid-19 is high or rising exponentially.
Sir Patrick Vallance, the Government's chief scientific adviser, said that without interventions, the UK could see 200 or more deaths per day by mid-November.
He warned that if current infection rates continue, the UK could see around 50,000 cases a day by the middle of October.
The fresh restrictions sparked anger from the hospitality sector, with Kate Nicholls, chief executive of UKHospitality, describing them as "another crushing blow" for many businesses.
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"A hard close time is bad for business and bad for controlling the virus - we need to allow time for people to disperse over a longer period," she said.
"Table service has been widely adopted in some parts of the sector since reopening but it is not necessary across all businesses, such as coffee shops.
"It is hard to understand how these measures are the solution to fighting the disease when Government data shows that just 5% of infections out of the home are related to hospitality."