The British government is signaling that it may join the Arab coalition against the Muslim Brotherhood by announcing an investigation of the group spearheaded by the ambassador to Saudi Arabia. The Saudis joined Egypt in banning the Brotherhood as a terrorist group last month.

Prime Minister David Cameron said, "We want to challenge the extremist narrative that some Islamist organizations have put out."

He explained that the British government would not focus only on "violent extremism," but the ideologies driving it. That is a sharp difference from the U.S. government, which will not even say the word "Islamist" and has a narrow focus on violence.

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