In his speech to business leaders, David Cameron is expected to acknowledge that we're living in "perilous economic times".
"Turn on the TV news and you see the return of a crisis that never really went away: Greece on the brink…the survival of the Euro in question," he is expected to add.
"Faced with this, I have a clear task: to keep Britain safe.
"Not to take the easy course - but the right course."
More top news
Police are investigating the death of a two-month old baby in Blackpool.
Merseyside police have released emotional new images of murdered PC Dave Phillips and his young family.
The daughter of a Hillsborough victim, who was only two when he died, has been hearing evidence about her father's last moments.