Sen. Bernie Sanders, I-Vt., will introduce legislation Thursday with Rep. Ro Khanna, D-Calif., intended to force Walmart to pay workers at least $15 an hour. The bill would institute fines for corporations that buy back their own stock unless they set their workers’ base pay at that level.

“Last year, 4 members of the Walton family of Walmart made $12.7 billion in 1 day. It would take a full-time Walmart worker making $11/hr over 653,000 years to make that much. Thursday, @RepRoKhanna and I are introducing legislation to make Walmart pay its workers a living wage,” Sanders tweeted Tuesday.