Flake voted for Kavanaugh to move out of the committee. As in, they would not support Kavanaugh's confirmation unless and until the FBI investigation happens. President Donald Trump bowed to the inevitable on Friday afternoon, ordering an FBI investigation. With Flake and Murkowski now on the record saying they will not support Kavanaugh unless there is an FBI investigation, McConnell's hands were effectively tied. Earlier this week, the President publicly expressed his unhappiness with the fact that the vote on Kavanaugh hadn't happened yet.
Source: CNN September 28, 2018 19:20 UTC