2 September 2013 Last updated at 07:33 ET Mr Greenwald says NSA documents show how the US spied on Mexico and Brazil Brazil says it will demand an explanation from the US after allegations that the National Security Agency (NSA) spied on Brazilian government communications.
The allegations were made by Rio-based journalist Glenn Greenwald in a programme on TV Globo on Sunday.
Mr Greenwald obtained secret files from US whistle-blower Edward Snowden.
Communications from the Mexican president were also accessed by the NSA, Mr Greenwald said.
Mr Greenwald, a columnist for the British Guardian newspaper, told TV Globo’s news programme Fantastico that secret documents leaked by Edward Snowden showed how US agents had spied on communications between aides of Brazil’s President Dilma Rousseff.
‘Attack on sovereignty’Brazil’s Justice Minister Jose Eduardo Cardozo said that “if these facts prove to be true, it would be unacceptable and could be called an attack on our country’s sovereignty”.
According to the report, the NSA also used a program to access all internet content that President Rousseff visited online.
The report also alleges that the NSA monitored the communications of Mexican President Enrique Pena Nieto before he was elected.
Mr Greenwald said that a document dating from June 2012 showed that Mr Pena Nieto’s emails were being read.
A spokesman for the Mexican foreign ministry told the Agence France Presse news agency that he had seen the report but had no comment.
The documents were provided to Mr Greenwald by ex-US intelligence analyst Edward Snowden, who was granted temporary asylum in Russia after leaking secret information to media in the US and Britain.
Mr Greenwald was the first journalist to reveal the secret documents leaked by Mr Snowden on 6 June. Since then, he has written a series of stories about surveillance by US and UK authorities.
The detention last month for nine hours at London’s Heathrow airport of Mr Greenwald’s partner, David Miranda, caused widespread controversy in the UK and abroad.
Mr Greenwald said the detention of his partner amounted to “bullying” and was “clearly intended to send a message of intimidation” to those working on the NSA revelations.
The British government said that it was right for the police to act if they believed that someone had “highly sensitive stolen information”.
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NSA "spied on Brazil and Mexico"