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CNN anchor Rick Sanchez says Fox News flat-out lied in an ad accusing its cable rivals of not covering a political protest.

In Friday's Washington Post, Fox News took out a full-page ad noting its coverage of the Sept. 12 Tea Party, in which protesters across the nation rallied against more government spending. "How did ABC, CBS, NBC, MSNBC and CNN miss this?" the ad asked.

Sanchez said on Friday that the ad is false, showing video proof that CNN was there covering the action.

"The bottom line is we do cover the news and we did extensively cover this event," said Sanchez. "We didn't promote the event. That's not what real news organizations are supposed to do. We covered the event."

Other networks, including those listed in the ad, were also in attendance at the Tea Party, providing live coverage of the tens of thousands of protesters in D.C. last Saturday. Sanchez said Fox News' ad was tantamount to serious disrespect, adding, "You know, that's an offense to myself and to my colleagues, who risk their lives for our viewers in Iraq and Afghanistan and around the world to bring the news. You're actually telling people that we didn't cover a rally on Washington."

Fox News VP of Marketing, Michael Tammero, stands by Fox's criticism of the other networks' coverage. "Generally speaking, it's fair to say that from the tea party movement ... to Acorn ... to the march on 9/12, the networks either ignored the story, marginalized it or misrepresented the significance of it altogether."

Sanchez said that Fox News has not responded to a request for an apology. "Let me address the Fox News network now perhaps the most current way that I can, by quoting somebody who recently used a very pithy phrase — two words. It's all I need — you lie," added Sanchez.