BOMBSHELL: Over 100,000 Syrians have already entered the USA since 2012 without adequate screening

Number of immigrants has some worried that more sleepers could already be here, living as citizens or aliens.

While American presidential contenders argue over the admission of 10,000 Syrian refugees, another 100,000 have already entered the country since 2012, and continue to do so on visas, work permits, and green cards. It is unlikely these immigrants are being thoroughly vetted.

LOS ANGELES, CA (California Network) - Americans are so worried about ISIS infiltrating the USA via a proposal to admit 10,000 Syrian refugees to the country, they have forgotten about the perfectly legal, ongoing immigration of Syrians into the USA which happens each year. Since 2012, over 100,000 refugees have entered the country legally.

Most of those people have entered the USA during the period of upheaval that has seen the rise of ISIS and other terrorists in Syria. And few of those people received much vetting.

Jessica Vaughn from the Center for Immigration Studies told Fox News that the sheer volume of people was so much that it "makes it impossible for our counter-terrorism authorities to keep track of them all, much less prevent them from carrying our attacks or belatedly try to deport them."

Basically put, the USA is distracted with the refugee crisis that we're ignoring the constant flow of Syrians in and out of the country, year after year. It is impossible to vet and to track the sheer volume of people.

If ISIS wants to infiltrate the USA, it doesn't need a refugee program to do it. They already can, and perhaps already have infiltrated nicely.

In the first half of 2015 alone, over 15,000 visa holders from Syria entered the country. Since 2012, over 42,000 Syrians have been granted green cards or citizenship.

The concern is that more terrorists are living in the country legally, waiting to make San Bernardino-style attacks.

There is obviously a greater need to better screen those who wish to visit or resettle in the USA.

The 10,000 refugees in Obama's proposal is just the tip of the iceberg.