US Secretary of State Rex Tillerson has said the decision to blacklist the entirety of the Muslim Brotherhood as a "terror" group complicates the security and politics of the Middle East.
Tillerson said it was problematic to place the entire organisation - whose members amount to more than five million, some of whom occupy positions in governments across the region - on a "terror list".
His testimony on Wednesday before the House Committee on Foreign Relations comes amid rising tensions in the Gulf, part of which centre on Qatari support for the Muslim Brotherhood.
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