The debate on spying has only just begun, said Guardian journalist Glenn Greenwald who published the revelations of NSA whistleblower Edward Snowden.
Responding to reforms on surveillance announced by President Obama today, Mr Greenwald told Channel 4 News: "There are some changes, some which are substantive such as putting an actual advocate in the Fisa court so not only the government is heard from.
"I think the problem is the fundamental nature of the NSA that has created worldwide controversy namely spying on people by the hundreds of millions without suspicion, will continue to endure".
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The chancellor now faces the prospect of forming a minority government or calling for a snap election.
The 73-year-old said a return is unlikely "given the politicised atmosphere that seems to have afflicted our set."
Chancellor Philip Hammond said the UK will make a financial proposal to the EU in the next three-and-a-half weeks.