Suspected British jihadists will be monitored more closely and convicted terrorists given longer prison sentences as part of a package of counter-terrorism measures to be unveiled tomorrow.
Technology companies will also be called on to do more to tackle extremist content posted online, while new powers will be introduced to fast-track terror suspects to jail before they have finalised any plans for an attack.
Sajid Javid, the Home Secretary, is also expected to announce a fresh approach to targeting the growing threat of right-wing extremism, illustrating how potential sources of terrorism have become increasingly diverse.
His speech follows a review of the UK's counter-terrorism strategy, known as Contest, and coincides with the anniversary of the London Bridge and Borough Market attack.
It comes as the family of James McMullan, the only British person killed in the attack, tell the Sunday Telegraph how they feel abandoned by the authorities and have been barred from fitting a bronze plaque at the spot where he was murdered.