On “Morning Joe” Monday morning, journalist Glenn Greenwald dismissed MSNBC co-host Mika Brzezinski for reading off of “White House talking points” during an interview the network had with him.

Brzezinski indicated that Greenwald’s stories were raising the wrong kind of speculation about the programs, reminding him that they were in fact legal.

“I just want an answer, yes or no,” she began. “Isn’t it the case that reviewing of e-mails or any wiretapping cannot take place without an additional warrant from a judge and a review? It’s not like there’s haphazard probing into all of our personal e-mails.”

“The White House talking points that you’re using are completely misleading and false,” Greenwald replied heatedly, reminding her that the National Security Agency was exercising the power to listen to phone conversations and read emails of American citizens communicating overseas.

“The only time individual warrants are needed is when two people are both inside the United States and are both American citizens,” he explained. “But under that law, the U.S. government and the NSA have the power and exercise the power to listen in on telephone conversations and read e-mails, involving all kinds of American citizens.”