Two leading Democrats who have had roles tackling global Islamic extremism believe one of the key reasons the U.K. has experienced multiple attacks is because of how the country treats Muslims.

In separate interviews on Sunday former Secretary of State John Kerry and Vice Chairman of the Senate Intelligence Committee Mark Warner said that there have been fewer acts of domestic terror committed by Muslims in the United States because it has historically been more welcoming to Muslim immigrants.

Radicalization experts who study counter-terrorism and countering violent extremism told Newsweek that they agreed poor integration was one of the root causes behind recent attacks, including the vehicle and stabbing incident in London on Saturday in which three men killed seven people and injured dozens.

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