1. throw away all illegal muslims/arabs
2. disallow for now tourist visas for arabs/muslims
3. check ALL immigration papers and declarations of "legal" arabs/muslims in america, probably find out that 50% lie in their depositions, and throw them out as well
4. instead of just sitting like ducks and waiting for the attack, start the "retaliation" (prevention) even before they strike: kick their ass in syria, lebanon, iraq and iran.
