Lauren McFerran's nomination to continue serving on the National Labor Relations Board for the next five years has been blocked.The vote means NLRB will likely flip to a Republican majority.AFL-CIO President Liz Shuler blames Sens. Joe Manchin and Kyrsten Sinema for the outcome.The NLRB's remaining members include Gwynne Wilcox, David Prouty, and Marvin E. Kaplan.