Prime Minister David Cameron has said the Guardian has damaged UK security by publishing intelligence revelations based on leaks from former NSA contractor Edward Snowden.
When asked by a Labour MP to whether he supported the paper for its coverage, he said: "I certainly wouldn't congratulate the Guardian newspaper."
"I can see what has been done here where information has been published about the work of our security and intelligence services, which quite frankly will make this country less safe."
He added: "We live in a free country so newspapers are free to publish what they want.
"We have not been heavy-handed and come in with injunctions and all the rest of it, but we do appeal to newspapers to use judgment and common sense and responsibility when they are making these decisions."
"As technology develops and the threats we face evolve, so we need to make sure that the scrutiny and the frameworks in place remain strong and effective," said Mr Cameron.
As well as helping catch UK criminals, he said intelligence "has also allowed us to warn our EU allies about terrorist plots aimed at their people, about cyber attacks on their business and infrastructure and about attempts in their own states to illegally traffic drugs, people, arms and money."
"We put in place over recent years under governments of both parties, I think, very good arrangements for governing our intelligence services and we should be proud of the work they do."
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.
The US National Security Agency intercepted 60 million phone calls made in Spain during the space of a month, according to reports in Spanish newspapers El Pais and El Mundo.
According to documents provided by US whistleblower Edward Snowden, the NSA allegedly collected numbers, locations, durations of calls and serial numbers of phones between December 10 2012 and January 8 this year. The reports claim the data collected did not include the content of the calls.
US intelligence officials have denied German newspaper reports that Barack Obama was briefed by National Security Agency (NSA) chief Keith Alexander about Angela Merkel's phoned being tapped.
NSA spokeswoman Vanee Vines said:
[General] Alexander did not discuss with President Obama in 2010 an alleged foreign intelligence operation involving German Chancellor Merkel, nor has he ever discussed alleged operations involving Chancellor Merkel.
The US may have bugged Angela Merkel's phone for more than 10 years, according to German newspaper Der Spiegel.
The news report also said President Obama told the German leader he would have stopped it happening had he known about it.
Der Spiegel said Merkel's mobile telephone had been listed by the NSA's Special Collection Service (SCS) since 2002 - marked as "GE Chancellor Merkel" - and was still on the list weeks before Obama visited Berlin in June.
In an SCS document cited by the magazine, the agency said it had a "not legally registered spying branch" in the US embassy in Berlin, the exposure of which would lead to "grave damage for the relations of the United States to another government".