Google's Eric Schmidt said he is outraged by reports that the National Security Agency (NSA) is secretly monitoring transmissions between its data centers.

"It's really outrageous that the National Security Agency was looking between the Google data centers, if that's true," Schmidt told the Wall Street Journal.

Schmidt said the NSA appears to be side-stepping good judgment and violating peoples' privacy to get what it needs, and suggested it's "perfectly possible" that more revelations are to come.

Last week, citing documents leaked by former NSA contractor Edward Snowden, The Washington Post reported on a program known as MUSCULAR, which allegedly operates in conjunction with the U.K. version of the NSA, the Government Communications Headquarters (GCHQ).

"From undisclosed interception points, the NSA and GCHQ are copying entire data flows across fiber-optic cables that carry information between the data centers of the Silicon Valley giants," according to the Post.

In a statement, the NSA said it has "multiple authorities that it uses to accomplish its mission, which is centered on defending the nation."

"The Washington Post's assertion that we use Executive Order 12333 collection to get around the limitations imposed by the Foreign Intelligence Surveillance Act and FAA 702 is not true," the agency said last week. "The assertion that we collect vast quantities of U.S. persons' data from this type of collection is also not true. NSA applies Attorney General-approved processes to protect the privacy of U.S. persons – minimizing the likelihood of their information in our targeting, collection, processing, exploitation, retention, and dissemination. NSA is a foreign intelligence agency. And we're focused on discovering and developing intelligence about valid foreign intelligence targets only."

At the time, David Drummond, Google's chief legal officer, said the news "underscores the need for urgent reform."

Tech firms have also come under fire in the NSA scandal, particularly in regards to the PRISM program. Initially, news outlets reporting on PRISM said it gave the NSA unfettered access to the servers of companies like Google, Microsoft, Facebook, and Yahoo. But the companies denied this was the case, and the NSA said all requests for information were done legally through the Foreign Intelligence Surveillance Court (FISC). The secretive nature of that court, however, makes it difficult to verify that information, and top tech firms have been fighting for the right to be more transparent about the FISC requests with which they comply.