Quite possibly, and in more ways than one.
Let's just look though at one possibility. Every day the border patrol posts counts of folks coming across the southern border. And since Biden basically opened the border those numbers are up, way up. And the BP logs them by country. And every day there are some from various middle eastern nations.
Now, what about those that sneak across and don't get caught?
Remember that some of the individuals in the 911 attack were here on student visas. Expired at that. Heck, what's to say that terrorists have already infiltrated this country and waiting for the signal to cause problems.
The World Trade Center was a well known geographical site, with a total workday population bigger than many small towns in the US, How about this:
On a typical weekday, an estimated 50,000 people worked in the complex and another 140,000 passed through as visitors.
What is to say that a group of terrorists wouldn't want to create murderous activities in multiple small towns? Primarily because the residents might just be a little too complacent?
I know, if I mention the middle east origin of those coming across the southern border, especially those sneaking across then I am xenophobic, yada yada yada.
And, IMHO, anybody who thinks that all of those same folks are coming across with love in their hearts for our country, well, they are just plain dumb!!!!
Be vigilant folks. Remember the folks that were slaughtered in their sleep, the infants that were dismembered, the women that were tortured and raped.
Remember how the late Queen Elizabeth had our national anthem played at Buckingham Palace right after 911!
Below is "Hatikvah", the Israeli national anthem.