Washington, D.C. Mayor Vincent Gray has vetoed a bill to provide retail workers with a living wage following pressure from Wal-Mart and other chains. The bill would have required large retailers to pay their employees at least $12.50 an hour. Wal-Mart had threatened not to open three out of six stores planned for the area if the measure was passed. Mayor Gray called the bill a “job-killer,” saying Target, Home Depot and other retailers also objected. The D.C. City Council could still override the mayor’s veto. Wal-Mart workers have launched a series of strikes recently to demand higher wages and better conditions.