Border wall would do nothing to stop terrorism. And there is no national emergency. – CNN

In the United States since the 9/11 attacks, 455 jihadist terrorists have been charged or convicted or died before they faced trial. Not one of these terrorists crossed the southern border.
It turns out that terrorists trying to attack the United States would prefer not to travel to Central America or Mexico and then try their chances crossing the southern border. They want to fly directly to the States.
And anyway, the vast majority of terrorists don’t enter the United States at the southern border or anywhere else, because they are already in the country. Of the 455 jihadist terrorism cases since 9/11, 84% involved US citizens or permanent residents, and every lethal terrorist attack in the United States since 9/11 was carried out by a US citizen or legal resident.
On Sunday, Sarah Sanders, the White House press secretary was interviewed by Chris Wallace on Fox News, who challenged her on the supposed terrorist threat at the border.
Sanders asserted, “We know that 4,000 known or suspected terrorists come into our country illegally and we know that the most vulnerable point of entry is at our southern border.”
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This is itself is a misleading statistic since these 4,000 individuals are not really terrorists but have shown up as a “hit” on a terrorist watch list. The ‘TIDE’ terrorism watch list as of 2017 consisted of 1.6 million individuals who are deemed to have some possible link to terrorism.
The 4,000 individuals turned away from entering the US are those who may have some kind of putative connection to terrorism. They are not proven terrorists, otherwise, they would be arrested and charged. And there isn’t a case since 9/11 of a terrorist being arrested at the border, according to New America’s research.
A southern border wall would do absolutely nothing to stop terrorism, which in the United States today is almost entirely a “homegrown” phenomenon driven by jihadist materials on the internet, which knows no borders.