No way Jose! Once the policy of detention of illegals is implemented (after an amnesty period for illegals to go home), word will get around real fast that Uncle Sam's Welfare Tit has been closed for illegals.
The way that the Russian style camps work, they cost almst zip. You load a train with barbed wire, lumber, tents and prisoners. You send the train out an abandoned rail spur in Montana or Nevada where seedlings need to be planted, or anti erosion work needs to be done.
The prisoners first build the fences and towers (under supervision). Only then they can build their huts. The guards live in mobile homes, it's all brought in on the train. The guards are retired military volunteers who will bring their own rifles and dogs. It's very economical.
After the first 100,000 illegals are spending their year of cutting brush and planting seedlings and digging drainage ditches, word will get out muy rapido a los otros. They will very quickly rediscover that life in Mexico, Guatemala or Algeria is better than a year in a Montana work camp prior to deportation. They will leave voluntarily to avoid a year of unpaid penal labor, believe me. They will be heading for the exits pronto.
All it would take is national will.