In several venues such as this comments thread
I have joked that we need to get space travel going so we can loot blue jungle aliens of their mineral resources to pay off our debts.
Some folks want to loot real-life aliens
"Eighty million Baby Boomers are going to retire in the next 40 years," said Sen. Lindsey Graham, a Republican member of the Gang of Eight. "We are going to need a lot more legal immigration than is in this bill. Who is going to take care of the Baby Boomers when we retire?"
"Our changing demographics have put a strain on our Social Security system," added Democratic Sen. Al Franken. "More young workers paying into the Social Security system will help ease that, and that is precisely what this bill will provide."
"They pay in for ten years, and ... they cannot receive any benefits for ten years," said Republican Sen. Bob Corker. "We have this huge amount of money that's going to be coming into the Social Security program and coming into the Medicare program, which candidly helps people in this nation because it makes those programs more solvent."