The disasters of Joe Biden’s open border policy are coming home to roost. The Molotov cocktail attack by a Hamas-loving Egyptian illegal migrant on a group of American Jews in Boulder, Colo., is just one deadly consequence.

The national police blotter is bulging with rapes, murders, robberies, assault, antisemitic attacks and all manner of crimes that never would have been committed if not for Biden’s insane decision to disband the suite of border protection policies President Trump had successfully implemented in his first term.

Just in the last month, Larisha Thompson, a 40-year-old mother of two, was murdered in her car during a random robbery attempt by six illegal migrants from Honduras aged 13-21 in South Carolina, and 18-year-old Air Force cadet Ava Moore was killed in a hit-and-run on her Jet Ski in Texas by two illegal migrants. Their names can be added to the growing tally of victims like Laken Riley, Rachel Morin and Jocelyn Nungaray, whose blood is on Biden’s hands.

It was a point of pride for Biden to stop building Trump’s border wall, abandon Trump’s Remain in Mexico policy and institute catch-and-release so that 15 million to 20 million illegal migrants crossed the border during his presidency and melted into the heartland.

He did it all with a flurry of executive orders on Day One, and a malign leftist as Homeland Security secretary, Alejandro Mayorkas.

Together, as the national media turned a blind eye, they set about systematically undermining border security and making illegal migration more efficient, creating the CBP One mobile app to allow mass entry without vetting, providing work permits without immigration hearings and flying illegal migrants at taxpayer expense in the dead of night into cities and towns across America. They tied the hands of Border Patrol agents and even falsely accused some on horseback of racism for simply doing their jobs.

Despite Biden’s lie that he was powerless to close the border and needed Congress to pass new laws, Trump in his first 100 days managed to virtually stop all illegal migration with executive orders and a strong border czar, Tom Homan, and Homeland Security Secretary Kristi Noem.

DHS announced in April that migrant crossings were down by 99.99%. Only five illegal aliens had been “temporarily” allowed into the US, most for health reasons, such as suffering a heart attack as they crossed the border. That is a staggering drop from the roughly 68,000 illegals released by the Biden administration during the same month last year. As well, fentanyl overdoses reportedly have declined.

But as spectacularly successful as the Trump administration has been, getting the border under control is the easy part. Now the president has to fulfil his Inauguration Day promise to deport “millions and millions of criminal aliens back to the places from which they came,” in the face of extraordinary pushback from a handful of Trump-deranged activist district judges.

White House Deputy Chief of Staff Stephen Miller has ordered ICE to double its quota to 3,000 illegals arrested per day at a “minimum,” he told Fox News, with the goal of 1 million deportations a year. But even if the administration achieves that goal, despite the lawfare being waged against it, that’s one-quarter or less of the people Biden let in.

Biden and Mayorkas’ deliberate rush to bring in as many illegal migrants as quickly as possible meant that vetting fell by the wayside.

“All of us who are in national security, this is what keeps us up at night,” one senior administration source told me this week. “This unknown factor of having an open- border asylum system being exploited by millions of people who have come into this country — and we don’t know who they are.”

He points out that under the cursory vetting system of the Biden years, there was no derogatory information on Boulder firebombing suspect Mohamed Sabry Soliman, who was granted a tourist visa and illegally overstayed with no consequences.

What we do know about potential “ticking time bombs” who have entered the country is frightening enough.

When Trump-appointed Director of National Intelligence Tulsi Gabbard came into office, she immediately ordered the National Counterterrorism Center to cross-reference asylum applications from visa overstayers and illegal border crossers with the database of known terrorists.

They identified 1,200 illegal aliens with terror ties who were allowed to remain in the US by Biden. These are people who applied for asylum but were released into the US because Biden had eliminated Remain in Mexico, which used to allow for thorough vetting of asylum claims before anyone entered the country — and also provided a deterrent to bogus claims.

The intelligence source says  another enormous risk Biden has saddled us with lies in the roughly 100,000 Afghan evacuees who were rushed in after Biden’s disastrous withdrawal from Afghanistan without proper vetting.

Then there are the eight Tajikistan nationals with alleged ties to ISIS who were arrested at the southern border last June, who were believed to be plotting a terrorist attack on US soil.

What we weren’t told, says the intelligence official, is that there were another 400 suspected terrorists from Tajikistan and Uzbekistan who were brought in last year by the same people-smuggling network and melted into the country, never to be heard from again.

Analysts who made this worrying discovery tried to tell their bosses in the Biden administration and were told to ignore it, claims the intelligence source. “They just had to stew on the information” and say nothing.

Now that Secretary of State Marco Rubio has designated eight violent criminal cartel gangs, among them Tren de Aragua and MS-13, as terrorist organizations, the NCTC has added another 30,000 aliens somewhere in the country with suspected terrorist ties.

That doesn’t account for potential terrorists among the roughly 2 million “gotaways” who deliberately evaded apprehension when they crossed the southern border, despite the freebies on offer if they registered with Border Patrol.

“These are just the knowns,” says the intelligence official. “There are millions [of gotaways] we don’t know about. These are the folks that had a lot to hide, who had blatant ties to terrorists and were here on a mission, not somebody looking for a better life.”

Just what that mission is we dread to find out, but what we do know is that Biden and his enablers made America a lot less safe.