Sens. Ron Wyden (D-OR) and Mark Udall (D-CO) want the American public to know that the NSA has been lying to them about their protections under the Patriot Act, and they want the NSA to know that we all know they're lying. The senators sent a letter to NSA asking them to correct the public information used in talking points and on a fact sheet that talks about how your privacy is being protected, specifically under Sec. 702—that's the part relevant to the PRISM internet surveillance program.
Here's NSA's apparent response to that request from Wyden and Udall.
Yep, they just took down the whole public page. Which was sort of pointless, because there are archives of it. We don't know what on that page Wyden and Udall think is misleading. That's because that part has to remain classified, and the senators couldn't reveal that in the part of the letter they made public. So these senators who know as much about the NSA programs as anyone say that we're not nearly as protected as the government is telling us, but they can't tell us how. So the NSA wipes out everything. Problem solved.