Trump softens on Edward Snowden: President says 'a lot of people think the NSA whistleblower is not being treated fairly' - after previously calling him a 'traitor' who should be 'executed'

Edward Snowden's book, Permanent Record, was released last year. 

It offers by far the most expansive and personal account of how Snowden turned from obscure NSA worker to whisleblower, a move which set off a national debate about the extent of government surveillance by intelligence agencies desperate to avoid a repeat of the September 11 attacks. 

Intelligence officials who conduct annual classified assessments of damage from Snowden's disclosures have said the documents will continue trickling out into the public domain for years to come.

Though the book comes six years after the disclosures, Snowden, who fled first to Hong Kong and then Russia, attempts in his memoir to place his concerns in a contemporary context. 

 'What is real is being purposely conflated with what is fake, through technologies that are capable of scaling that conflation into unprecedented global confusion,' he says.

The story traces Snowden's evolution from childhood, from growing up in the 1980s in North Carolina and suburban Washington, where his mother worked as a clerk at the NSA and his father served in the Coast Guard.

He came of age as the Internet evolved from an obscure government computer network and describes how a youthful fascination with technology - as a child, he took apart and reassembled a Nintendo console and, as a teenager, hacked the Los Alamos nuclear laboratory network - eventually led him to a career as an NSA contractor, where he observed high-tech spy powers with increasing revulsion.

Analysts used the government's collection powers to read the emails of current and former lovers and stalk them online, he writes.

One particular program the NSA called XKEYSCORE allowed the government to scour the recent Internet history of average Americans. 

He says he learned through that program that nearly everyone who's been online has at least two things in common: They've all watched pornography at one time or another, and they've all stored videos and pictures of their family.

'This was true,' he writes, 'for virtually everyone of every gender, ethnicity, race, and age - from the meanest terrorist to the nicest senior citizen, who might be the meanest terrorist's grandparent, or parent, or cousin.'

He struggled to share his concerns with his girlfriend, who joined him in Russia and is now his wife.

'I couldn't tell her that my former co-workers at the NSA could target her for surveillance and read the love poems she texted me. I couldn't tell her that they could access all the photos she took - not just the public photos, but the intimate ones,' he writes. 

'I couldn't tell her that her information was being collected, that everyone's information was being collected, which was tantamount to a government threat: If you ever get out of line, we'll use your private life against you.'

Before summoning a small group of journalists to Hong Kong to disclose classified secrets, knowing that a return to the US was impossible, he says he prepared like a man about to die. He emptied his bank accounts, put cash into a steel ammo box for his girlfriend and erased and encrypted his old computers.

These days he remains outside the reach of a US Justice Department that brought Espionage Act charges just weeks after the disclosures. 

He spends many of his days behind a computer and participating in virtual meetings with fellow board members at the Freedom of the Press Foundation. 'I beam myself onto stages around the world' to discuss civil liberties, he writes.

When he does go out, he tries to shake up his appearance, sometimes wearing different glasses. He keeps his head down when he walks past buildings equipped with closed-circuit television. Once, he says, he was recognized in a Moscow museum and consented to a selfie request from a teenage girl speaking German-accented English. 

It's unclear when or even if Snowden will return to a country where his family has deep roots. He traces his lineage back to the Mayflower and ancestors who fought in the Revolutionary War.

He was shaken by the September 11 attacks, but describes his 'reflexive, unquestioning support' for the wars that followed as the greatest regret of his life.

'It was as if whatever institutional politics I'd developed had crashed - the anti-institutional hacker ethos instilled in me online, and the apolitical patriotism I'd inherited from my parents, both wiped from my system - and I'd been rebooted as a willing vehicle of vengeance.'

He describes the 18 years since the September 11 attacks as 'a litany of American destruction by way of American self-destruction, with the promulgation of secret policies, secret laws, secret courts and secret wars'. 

Reporting by Ross Ibbetson for MailOnline