Former President Joe Biden warned on Tuesday that President Donald Trump has “taken a hatchet” to Social Security, weighing in on a critical issue for millions of Americans as the 82-year-old Democrat briefly returned to the national stage. Biden, who has largely avoided speaking publicly since leaving the White House in January, delivered his pointed message during an evening speech at the national conference of Advocates, Counselors and Representatives for the Disabled in Chicago. Watch full event here.