A senator with nothing left to lose politically is swinging for the fences on one of Washington’s most radioactive policy problems. Sen. Bill Cassidy (R-LA), who lost his Republican primary to a Trump-backed challenger earlier this year, is pushing a $1.5 trillion investment fund designed to shore up Social Security before his term ends on January 3, 2027.

The proposal comes after the Trump administration projected that Social Security will be unable to pay full benefits within six to seven years. That timeline turns what was once a distant fiscal abstraction into something that could affect current retirees and anyone planning to become one.

How the plan would work

The core idea is straightforward, even if the numbers are staggering. The federal government would borrow $300 billion per year for five consecutive years, totaling $1.5 trillion. That money would then be invested in a diversified portfolio of stocks and bonds.

Those assets would sit in escrow for roughly 70 to 75 years, designed to generate compounding returns that eventually fill the gap between what Social Security collects and what it owes.