I agree there was intelligence failure. However, if the perpetrators had been deported when they ceased to be in compliance with their visas they would not have been able to carry out the attack. The circumstances under which they received the visas were also questionable. I subscribe to the belief that it is better to err in keeping a good applicant out rather than allowing a bad one in.
At whatever point these guys made it into the U.S., immigration hadn’t really been seen as a real problem. When something is not seen as a problem, often, people can get lazy about procedures and processes. At that point, not sure if it was a people or a process problem. As far as I know, attack on U.S. national sovereignty wasn’t yet an implemented Leftist policy with Clinton.
But what is VERY clear to me, is that intelligence should have picked up these guys as part of UBL’s organization and a true threat.
What I have seen about our immigration problem was it became a true crisis under our Enemy in Chief Obama, who tried to basically eliminate our southern border. Under our Enemy in Chief Obama, attack on U.S. national sovereignty WAS an implemented Leftist policy.