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Aymen al-Zawahiri (search), Usama bin Laden's No. 2 man, threatens more attacks on London and the U.S. unless there is a complete troop withdrawal from Iraq. We'll ask retired U.S. Army Col. David Hunt, FOX News military analyst, and former CIA operative Wayne Simmons.

Then, only a couple months earlier, Aymen al-Zawahiri released a videotape calling for an "armed jihad" to bring change to the Arab world. If his messages are aimed to incite terror, who are they trying to reach out to? William Rosenau, political scientist at Rand Corporation, weighs in.

And, al-Zawahiri threatens Britain with more attacks because of the "aggression against Muslims" there. How might this affect relations with the Muslim community in Britain? We'll get insight from Gerard Baker, U.S. editor of The Times of London.

Real journalism: fair and balanced. That's why we're No. 1 — FOX News Channel.

About the Show

Veteran newscaster John Gibson gets to the core of the most salient issues facing America today as host of FNC's hard-hitting primetime show "The Big Story with John Gibson."

Airing Monday through Friday at 5 p.m. ET, "The Big Story" gives you expert legal analysis from Judge Andrew Napolitano.

"The Big Story with John Gibson" is one of the reasons that FOX News Channel is the most watched news network in daytime.

Note: All guests and topics subject to change