If you are talking about those that are already here, yes, you are correct. If you are talking about stopping more from coming in, then you are dead wrong.
Every single 911 terrorist entered this country legally.
Fine, what about the ones that are here now that entered the country illegally - that is at the heart of this story.
If you have the means to create a dirty bomb, you have access to the money for a plane ticket and a false set of identification. Why walk into this country when you can fly?
Again, you are correct. But, border security is not the only effort that should be made.
Here is what needs to happen
1). All visa holders from countries know to support or harbor terrorists should be called in to have their visa's renewed.
2). Foreigners from those countries not here on essential business should have their visa revoked or the time shortened.
3). Anyone that has overstayed their visa should be immediately deported. Escort them to where they have their belongings, watch them pack and then escort them to the plane.
4). Anyone visiting this country on a business or tourist visa should be required to provide the address where they are staying and it must be an approved locations such as a hotel, relative or an apartment with a predesignated authorization to house foreigners. Hotels and landlords in these designated location to be required to report to the homeland security the check in and check out of any foreigners staying there.
5.)Anyone caught living at an address that is not approved or reported will immediately have their visa revoked and will be escorted to the nearest international airport for a flight out.
6). All business and tourist visas will be 30 days. Extensions must applied for.
7). To get a handle on all those that have entered the country illegally, require them to report to immigration and obtain a temporary visa. If they can show they are gainfully employed, then put them on the road to a permanant green card status the same as if they came here legally and with all the same requirements.
8). Anyone here illegally that does not report and is caught is immediately deported after the deadline for reporting.
That is for starters. These are the steps needed to get a handle on this very large security issue.
Presumably any terrorist who has entered this country or will be entering this country has multiple sets of identity.