Large US retail companies will be forced to pay their workers at least 50 percent more than the minimum wage. It is part of a bill that has been approved in Washington . But retail giant Walmart has responded by threatening to scrap plans for three new stores. Al Jazeera's Kimberly Halkett reports from Washington, DC. http://www.aljazeera.com/video/americas/2013/07/201371155146304847.html