Story highlights David Sterman and Peter Bergen: Revised ban is a solution to a problem that doesn't exist

Homegrown terrorism, not immigration, is the source of the problem in the US, authors say

Peter Bergen is CNN's national security analyst, a vice president at New America and a professor of practice at Arizona State University. He is the author of "United States of Jihad: Investigating America's Homegrown Terrorists." David Sterman is a policy analyst at New America's International Security Program.

(CNN) On Sunday, President Donald Trump issued a proclamation updating his administration's travel ban policy to apply American travel restrictions to citizens of eight countries: Chad, Iran, Libya, North Korea, Somalia, Syria, Venezuela and Yemen.

As with two earlier versions of the travel ban, this most recent version would not have prevented a single death from jihadist terrorism in the United States since 9/11.

According to research by New America , 13 militants have committed an act of deadly violence inspired by jihadist ideology in the United States since 9/11. None of them came from any of the total of 10 countries that have been included in the three iterations of the Trump administration's travel ban.

Of the 13 lethal terrorists, eight were born in the United States, and all 13 were citizens or legal permanent residents of the United States at the times of their attacks.

Nor would the travel ban, in any of its forms, have prevented the 9/11 attacks, which were carried out by 15 Saudis, two Emiratis, an Egyptian and a Lebanese citizen. None of those countries are among those listed in the travel ban.

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