Ambassador Thomas Shannon arrived and left Brazil's Foreign Ministry without speaking to reporters. There was no comment from officials at Brazil's Foreign Ministry either.
The office of Brazil's President Dilma Rousseff said it had no immediate comment, but Rousseff was meeting with top ministers to discuss the case.
Lawmakers in Latin America's largest nation were outraged over the Globo TV network's report citing documents dated June 2012 from NSA leaker Edward Snowden.
Sen Ricardo Ferraco, head of the Senate's foreign relations committee, said that lawmakers already had agreed to formally investigate the US program's focus on Brazil because of earlier revelations that the country was a top target of the NSA program in the region, and that the probe would likely start work this week.
"I feel a mixture of amazement and indignation. It seems like there are no limits. When the phone of the president of the republic is monitored, it's hard to imagine what else might be happening," Ferraco told reporters in Brasilia. "It's unacceptable that in a country like ours, where there is absolutely no climate of terrorism, that there is this type of spying."
The document indicated who Pena Nieto would like to name to some government posts, among other information.
It's not clear if the spying continues.
As for Brazil's leader, the June 2012 document "doesn't include any of Dilma's specific intercepted messages, the way it does for Nieto," Greenwald told The Associated Press in an email. "But it is clear in several ways that her communications were intercepted, including the use of DNI Presenter, which is a program used by NSA to open and read emails and online chats."
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