Bernie Sanders targets Walmart with bill that would prevent stock buybacks unless companies pay workers $15 minimum wage

 Sen. Bernie Sanders, I-Vt., is introducing a bill Thursday that would prevent large companies from buying back stock unless their employees are paid at least $15 an hour.

The proposal is aimed squarely at the nation's largest bricks-and-mortar retailer: Walmart.

Sanders is one of the most vocal critics of what he deems unfair business practices and is an aggressive advocate for raising the minimum wage .