New York (CNN Business) Amazon? Check. Disney? Check. McDonald's?

The fast food chain is Senator Bernie Sanders' next minimum wage target. He wants McDonald's to give its workers a pay raise to $15 an hour.

"If McDonald's raised the minimum wage to $15 an hour and respected the constitutional rights of your workers to form a union, it would set an example for the entire fast food industry to follow," Sanders wrote in a letter addressed to Easterbrook and posted to his Twitter account.

Sanders said he talked to McDonald's employees who complained that their current pay makes getting by difficult. He claimed that many McDonald's employees need federal assistance, including food stamps and public housing.