Topics and Guests for July 20

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A Pakistani intelligence official confirms that authorities have arrested an "important" suspect in the London bombings. Meanwhile, police in London remove a shattered carriage from a subway station, signaling a shift in the investigation's underground forensic work. Could this "important" suspect be a break in the case? Team FOX is live with the latest.

A bomb making "factory" is uncovered south of the Saudi Arabia capital, putting Americans there on "high alert." We'll have the lowdown on this serious concern.

Then, the Bush administration raised no objection when the Saudis choose Prince Turki al-Faisal (search) as their pick for Saudi ambassador to the U.S. However, he allegedly has ties to Al Qaeda. Should the White House have protested the Saudis pick? We'll ask John Loftus, former intelligence officer and president of the Intelligence Summit.

And, as authorities conduct DNA tests on blonde hairs attached to a piece of duct tape found on a beach in Aruba, DNA samples are taken from jailed teen Joran van der Sloot and the now-released Kalpoe brothers. Could the DNA results provide a much-needed break in the Natalee Holloway case? Criminal forensic pathologist Dr. Cyril Wecht weighs in.

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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