Senate Intelligence Committee Chairwoman Dianne Feisntein (D-Calif.) said Sunday that the Obama administration's recently revealed surveillance programs have helped them bring two known terrorists to justice.

During an appearance on ABC's "This Week," Feinstein suggested there are other examples of the programs being successful, but noted two cases that have now been declassified. She pointed to a 2008 siege on a hotel in Mumbai and a 2009 plot to bomb the New York City subway program.

"One of them is the case of David Headley, who went to Mumbai to the Taj Hotel and scoped it out for the terrorist attack," Feinstein said. "The second is Najibullah Zazi, who lived in Colorado, who made the decision that he was going to blow up a New York subway."