Assembly Speaker Sheldon Silver won't approve the controversial selection of a politically-linked casino company to operate slot machines at the Aqueduct Racetrack until state officials conclude their investigation of the deal. Without Silver's signature, the project is on hold. "[E]verything should wait until that information is available," he told the Daily News. "[W]hat's important is we know we're signing on to something that's appropriate, and if not, we're not going to." It's unclear when the state inspector general will finish his probe of the Aqueduct deal, which is also being investigated by federal authorities. Any delays could cause the state to miss out on $300 million needed to close the growing budget gap.