Although we've had issues with those turning out to be foreign spies as well, so obviously you would need safeguards and serious vetting in place.

The better answer, move our legal immigration system to a more merit based intelligent one that better addresses our country's needs, and give these, and other, skills a higher priority than say, someone that simply has a relative here. I think that approach has been floated before, but I believe the "obstructionists" quickly came out against it.