On the anniversary week of the 9/11 terrorist attacks, President Obama is rolling out the welcome mat to tens of thousands of Syrian Muslim refugees. What could go wrong?

There's no need to hypothesize. Our nation remains utterly incapable of screening out legitimate dreamers from destroyers, liberty-seekers from liberty-stiflers. Indiscriminate asylum and refugee policies rob the truly deserving of an opportunity for freedom—and threaten our national security.

It's shameful that our leaders in Washington, sworn to uphold and defend our Constitution and our people, suffer chronic amnesia about the fatal consequences of open borders. I'll keep reprinting my reminders. Maybe someday someone in a position of power will pay heed, throw political correctness out the window, and stop hitting the snooze button.

Have you forgotten? Boston jihadist brothers Tamerlan and Dzhokhar Tsarnaev received dubious asylum status through their parents thanks to lax vetting. After entering on short-term tourist visas, their mother and father (an ethnic Chechen Muslim) won asylum and acquired U.S. citizenship. Next, younger son Dzhokhar obtained U.S. citizenship. Older son Tamerlan, whose naturalization application was pending, traveled freely between the U.S. and the jihad recruitment zone of Dagestan, Russia, a year before executing their Boston Marathon massacre. Though they had convinced the U.S. that they faced deadly persecution, the Tsarnaevs' parents both had returned to their native land and were there when their sons perpetrated their bloody terror rampage.

Have you forgotten? Ramzi Yousef landed at New York City's JFK airport from Pakistan and flashed an Iraqi passport without a visa to inspectors. He was briefly detained for illegal entry and fingerprinted, but was allowed to remain in the country after invoking the magic words "political asylum." Yousef was released for lack of detention space and headed to Jersey City to plot the deadly 1993 World Trade Center bombing.

Have you forgotten? Gazi Ibrahim Abu Mezer, a Palestinian bomb-builder, entered the U.S. illegally through Canada in 1996-97. He claimed political asylum based on phony persecution by Israelis, was released on a reduced $5,000 bond posted by a man who was himself an illegal alien and then skipped his asylum hearing. In June 1997, a federal immigration judge ordered Mezer to leave on a "voluntary departure order." Mezer ignored him. He joined the New York City bombing plot before being arrested in July 1997 after a roommate tipped off local police.

Have you forgotten? Mir Aimal Kansi, convicted in 1997 of capital murder and nine other charges stemming from his January 1993 shooting spree outside the CIA headquarters in McLean, Va., also exploited our insane asylum laxity. Despite his history as a known Pakistani militant who had participated in anti-American protests abroad, Kansi received a business visa in 1991. After arrival, he claimed political asylum based on his ethnic minority status in Pakistan. While his asylum application was pending, he obtained a driver's license and an AK-47, murdered two CIA agents and wounded three others.

Have you forgotten? Somali national Nuradin Abdi, the al-Qaida shopping mall bomb plotter convicted in 2007, first entered the U.S. in 1995 using a false passport. He entered again illegally from Canada in 1997 and secured asylum on false grounds. Abdi then was able to fraudulently obtain a refugee travel document, which he used to fly to Ethiopia and, yes, Chechnya for jihad training.

Have you forgotten? Among the convicted Fort Dix (N.J.) jihad plotters were three ethnic Albanian illegal alien brothers, Dritan, Shain and Eljvir Duka, who snuck into the country through Mexico with their parents. In 1984, the father applied for asylum, but the feds ignored them for two decades. In the meantime, as America showed the Dukas' refugee community unmatched compassion and generosity, the Muslim trio returned the favor by planning to massacre U.S. soldiers.

Have you forgotten? Are you not paying attention? The Somali refugee population in Minnesota has been a gold mine for jihadist recruiters for ISIS. America has failed miserably to assimilate waves of young Muslims from Africa and the Middle East.

Our asylum and refugee programs are routinely abused by ordinary fraudsters and Islamic terror plotters alike. Our immigration enforcement failures are compounded by deadly illegal alien sanctuary policies, a deportation abyss that allows hundreds of thousands of deportation fugitives to run loose, and the persistent lack of a tracking system to identity and kick out millions of foreign visa overstayers.

Michelle Malkin [email her] is the author of Invasion: How America Still Welcomes Terrorists, Criminals, and Other Foreign Menaces to Our Shores. Click here for Peter Brimelow’s review. Click here for Michelle Malkin's website. Michelle Malkin is also author of Unhinged: Exposing Liberals Gone Wild and Culture of Corruption: Obama and his Team of Tax Cheats, Crooks & Cronies.

Her latest book is "Who Built That: Awe-Inspiring Stories of American Tinkerpreneurs."