Prime Minister David Camerson said Britain's security agencies operated within the law and were subject to "proper scrutiny."
Foreign Secretary William Hague will address the House of Commons later amidst accusations Britain's GCHQ was involved in the NSA surveillance programmes.
Deputy Political Editor Chris Ship reports.
The Foreign Secretary said British intelligence would never use its partnership with the United States to get around UK laws.
GCHQ (Government Communications Headquarters) is one of three UK intelligence agencies that form the UK's security and intelligence system.
Facebook, Google and Microsoft have all denied claims that they cooperated with US intelligence agencies to gather data on foreign users.