why hasn't the director of national intelligence been punished for lying to congress?

WaPo |  Snowden also repeatedly compared his actions with that of Director of National Intelligence James R. Clapper, who denied that the NSA was "wittingly" collecting data on millions of Americans in a Senate Intelligence Committee hearing last spring -- a claim at odds with revelations about domestic phone records collection as a result of documents provided by Snowden. Clapper later apologized to Congress in a letter, saying his answer was "clearly erroneous."

But in a letter to the editor in the New York Times earlier this year, ODNI general counsel Robert Litt denied that Clapper had "lied" to Congress, but rather said he made an honest mistake. Although ODNI was provided the question in advance on the hearing by Senator Ron Wyden (D, Oregon), Clapper had not seen it, wrote Litt, and answered the question while having American's content information in mind. When his mistake was pointed out days later, Clapper corrected the issue with Wyden, but Litt argues "it could not be corrected publicly because the program involved was classified."

"The oath that I remember is James Clapper raising his hand, swearing to tell the truth and then lying to the American public," Snowden said. "I also swore an oath, but that oath was not to secrecy, but to defend the American Constitution."

Snowden recalled raising what he called the "famous lie" with co-workers, questioning why no one did anything about it, only to be warned about potential consequences. Snowden has previously said he raised concerns internally, but that as a contractor, he did not have the same protections as a government employee.

While Clapper has accused Snowden of perpetrating the most "massive and damaging theft of intelligence" in U.S. history, Snowden argues his actions were serving a larger public interest that superseded the national intelligence need for secrecy.

Later in the speech, he described Clapper as having "committed a crime by lying under oath to the American people," and questioned why charges were never brought against the director. By contrast, Snowden said, charges were brought against him soon after he revealed himself as the source of the leaks.