A sample size of 1000 is fine to statistically extrapolate to a country the size of US. You just have to pick your sample properly. You can show anything with a poll by tweaking your qualification criteria. If people were picked randomly, polls would be even more worthless than they are now.
As for security issues.... what exactly are those 'fundamental security risks', and how exactly has the administration addressed them?
The illegal aliens... well, if you're not gonna get rid of them, might as well make them legal and collect some taxes off them. It's not like they're leaving on their own.
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