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Eventually his efforts paid off with his first story appearing in the St Louis Post-Despatch, which was then syndicated across America and eventually earned him the Pulitzer Prize. "I did five stories. I charged $100 for the first, by the end the [New York] Times were paying $5,000."

He was hired by the New York Times to follow up the Watergate scandal and ended up hounding Nixon over Cambodia. Almost 30 years later, Hersh made global headlines all over again with his exposure of the abuse of Iraqi prisoners at Abu Ghraib.

Put in the hours

For students of journalism his message is put the miles and the hours in. He knew about Abu Ghraib five months before he could write about it, having been tipped off by a senior Iraqi army officer who risked his own life by coming out of Baghdad to Damascus to tell him how prisoners had been writing to their families asking them to come and kill them because they had been "despoiled".

"I went five months looking for a document, because without a document, there's nothing there, it doesn't go anywhere."

Hersh returns to US president Barack Obama. He has said before that the confidence of the US press to challenge the US government collapsed post 9/11, but he is adamant that Obama is worse than Bush.

"Do you think Obama's been judged by any rational standards? Has Guantanamo closed? Is a war over? Is anyone paying any attention to Iraq? Is he seriously talking about going into Syria? We are not doing so well in the 80 wars we are in right now, what the **** does he want to go into another one for. What's going on [with journalists]?" he asks.

He says investigative journalism in the US is being killed by the crisis of confidence, lack of resources and a misguided notion of what the job entails.

"Too much of it seems to me is looking for prizes. It's journalism looking for the Pulitzer Prize," he adds. "It's a packaged journalism, so you pick a target like - I don't mean to diminish because anyone who does it works hard - but are railway crossings safe and stuff like that, that's a serious issue but there are other issues too.

"Like killing people, how does [Obama] get away with the drone programme, why aren't we doing more? How does he justify it? What's the intelligence? Why don't we find out how good or bad this policy is? Why do newspapers constantly cite the two or three groups that monitor drone killings. Why don't we do our own work?

"Our job is to find out ourselves, our job is not just to say - here's a debate' our job is to go beyond the debate and find out who's right and who's wrong about issues. That doesn't happen enough. It costs money, it costs time, it jeopardises, it raises risks. There are some people - the New York Times still has investigative journalists but they do much more of carrying water for the president than I ever thought they would … it's like you don't dare be an outsider any more."

He says in some ways President George Bush's administration was easier to write about. "The Bush era, I felt it was much easier to be critical than it is [of] Obama. Much more difficult in the Obama era," he said.

Asked what the solution is Hersh warms to his theme that most editors are pusillanimous and should be fired.

"I'll tell you the solution, get rid of 90% of the editors that now exist and start promoting editors that you can't control," he says. I saw it in the New York Times, I see people who get promoted are the ones on the desk who are more amenable to the publisher and what the senior editors want and the trouble makers don't get promoted. Start promoting better people who look you in the eye and say 'I don't care what you say'.

Nor does he understand why the Washington Post held back on the Snowden files until it learned the Guardian was about to publish.

If Hersh was in charge of US Media Inc, his scorched earth policy wouldn't stop with newspapers.

"I would close down the news bureaus of the networks and let's start all over, tabula rasa. The majors, NBCs, ABCs, they won't like this - just do something different, do something that gets people mad at you, that's what we're supposed to be doing," he says.

Hersh is currently on a break from reporting, working on a book which undoubtedly will make for uncomfortable reading for both Bush and Obama.

"The republic's in trouble, we lie about everything, lying has become the staple." And he implores journalists to do something about it.

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