http://www.prb.org/Content/ContentGroups/Report/025/ReportonAmericaGovtSpendng.pdf
Pay close attention to page 6.
Yeah, it says we'd need at least 5 million legal immigrants per year to save an inherently flawed system! I don't see the logic of making the immigration problems worse in order to prop up a Soc Sec system that should be moved towards private retirement accounts and away from a pay as you go system.
But again, if that is the solution one prefers, then the politicians should just be honest about it. Bush, Kerry, etc should go before the public and say that they want to increase immigration levels by a factor of 5, that they want 5 million legal immigrants per year instead of our already large influx of one million per year. Honesty is preferable to deception.
They also mention the National Academy of Sciences study done back in the mid-late 90s to study the fiscal impact of immigration. The bottom line of that study was that immigration was a net benefit -- to the whopping tune of about one tenth of one percent of GDP. In other words; nothing.