Guardian journalist Glenn Greenwald has told ITV News "even the most advanced intelligence services" would find it "impossible" to access information that he and his partner carry across the world because it is too well encrypted.
In his first British TV interview, Mr Greenwald refused to confirm what data his boyfriend David Miranda had confiscated by police when he was detained for nine hours at Heathrow Airport on Sunday as he headed back to Brazil.
The independent reviewer of terrorism legislation said he will examine the detention of David Miranda at Heathrow Airport.
Nick Clegg has backed David Cameron's decision to send a top civil servant to The Guardian to urge them to destroy classified data.
The Guardian journalist whose partner was held at Heathrow Airport hits out at the UK as he gives ITV News his first British TV interview.