But McCain said members of the extremist group represent only 7% of the nation's rebel forces, who number 100, 000.
The letter outlined how the government had banned the organisation Besseres Hannover, (Better Hannover), a right-wing extremist group from Lower Saxony.
Mrs Tebbutt was reportedly taken at first to a part of southern Somalia largely controlled by the Islamist extremist group al-Shabaab.
The Anti-Defamation League (ADL), which monitors hate in the US, describes the ABT as "the most violent extremist group in the United States".
Police in Belgium, France, Germany, Italy and Switzerland arrested more than 80 people thought to be connected to an Algerian extremist group .
"It clearly was the act of an extremist group that apparently was targeting Americans and Britons, but the truth is most of the people who were killed were Indian, " he said.
Unite Against Fascism said it would be holding an anti-racism demonstration to coincide with the EDL rally, and the anti-extremist group Hope Not Hate is urging the home secretary to act.
President Barack Obama's adviser on Muslim affairs, Dalia Mogahed, has provoked controversy by appearing on a British television show hosted by a member of an extremist group to talk about Sharia Law.
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Some speculate that an extremist Salafist group may have been behind the assassination, but official investigators have yet to report back.
The dominant narrative of the Tea Party as an extremist fringe group isolated from the American mainstream is distant from the truth.
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Some speculate an extremist Salafist group may have been behind it.
And it was an extremist Jewish group's unfulfilled threat to lay a symbolic foundation stone for a new temple that apparently sparked the demonstrations on Sunday.
The extremist right-leaning NPD group won 6% of the vote, winning seats and reopening the door to criticism from most party leaders for its anti-immigrant stance, among other ideals.
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