Spain today summoned the US ambassador to discuss alleged spying on Spanish citizens, saying Washington's alleged behaviour would be "unacceptable" if true.
"Spain has relayed to the United States the importance of preserving a climate of trust ... and its interest in understanding the full reach of practices that, if true, would be considered inappropriate and unacceptable between allies," the Spanish foreign ministry said in a statement.
Madrid has also asked the United States to provide more data from the National Security Agency, it said.
The statement was issued after a meeting between Spain's Secretary of State for the European Union, Inigo Mendez de Vigo, and US Ambassador to Spain James Costos.
More top news
Changes in gait could prove to be an early sign of Parkinson's disease, according to a new study.
Tomorrow a new band of rain will move across mainly western Scotland, further south it will stay bright with some sunny spells.
The story of Darek Fidyka, who can walk again four years after his spine was severed, is hopeful. But one case study is very limited.