A House Republican says Congress won't be bailing out the Washington area's struggling subway system after a series of crises.

Rep. John Mica of Florida said at a hearing Wednesday that the Metro system has received more than $700 million in federal grants for capital improvements that haven't been spent. He says Metro's problems can be traced to poor management.

Last month, Metro's general manager made the unprecedented decision to shut down the system for an entire day for emergency safety inspections. At the time, he said he couldn't guarantee that the system was safe after two fires caused by faulty power cables.

Metro's board chairman, Jack Evans, says the problems can be traced in part to a lack of dedicated funding that has led to deferred maintenance.