Brazil's President Dilma Rousseff has postponed a visit to Washington because of concerns over U.S. spying.
The White House said on September 17 that President Barack Obama spoke with the Brazilian leader the previous day.
White House spokesman Jay Carney said Obama told Rousseff that he "regrets the concerns disclosures of alleged U.S. intelligence activities have generated in Brazil."
Carney said Obama also told his Brazilian counterpart that he is "committed to working together with President Rousseff and her government in diplomatic channels to move beyond this issue as a source of tension in our bilateral relationship."
The delay reflects Rousseff's irritation over disclosures that the U.S. National Security Agency (NSA) spied on her e-mail communications with her aides.
The alleged surveillance was made public by documents leaked by former U.S. intelligence contractor Edward Snowden, who is seeking asylum in Russia.
Based on reporting by AFP and AP