Although federal officials have long recognized improper spending as a problem, it is not the main reason for the program’s dire financial outlook

After labeling Social Security “a Ponzi scheme,” Elon Musk’s offensive against the social-insurance program took another aggressive turn.

Elon Musk pushed debunked theories about Social Security on Monday while describing federal benefit programs as rife with fraud, suggesting they will be a primary target in his crusade to reduce government spending.