From a press release by the National Retail Federation:

If this bill is passed, Congress would be throwing away over half a century of labor law in a single month," NRF Vice President for Government and Political Affairs Rob Green said. "Most lawmakers haven't had a chance to examine what this bill would do, and American workers aren't being given a chance to learn how this bill takes away their rights. When they do, they're going to oppose it. The changes proposed in this bill are too drastic to be pushed through on a fast track that hides the facts from the public.