five democratic u.s. senators include presidential candidate bernie sanders tell justice department federal communications commission thursday significant concern charter communications inc chtr.o plan acquisition time warner cable inc twc.n bright house network senators also include elizabeth warren ed markey ron wyden al franken say letter agencies review proposal deal would create nationwide broadband duopoly charter comcast corp cmcsa.o nearly two-thirds u.s. high-speed broadband home senators urge government thoroughly address potential harm consumers also raise concern charter take significant debt could harm ability honor commitments build network include rural areas fcc say u.s. broadband price among world expensive accord senators urge competition merger could lead high price few innovative service add charter say may would buy time warner cable 56 billion cash-and-stock deal would make u.s. internet cable company comcast shareholders company u.s. state approve deal still await clearance federal government wednesday charter say approval new jersey await clearance two state operate new charter company agree return time warner cable call center unite state add job demonstrate pending transactions time warner cable bright house network squarely public interest charter remain confident close timely fashion company say wednesday new charter would third-largest cable provider country serve roughly 17.3 million customers second-largest broadband provider 19.4 million subscribers would nearly 40 state charter time warner cable immediately respond request comment thursday fcc spokeswoman kim hart say commission receive letter review fcc hop complete review end march april comcast withdraw 45 billion offer time warner cable u.s. regulators raise concern deal would give unfair advantage cable tv internet-based service market democratic senators raise concern charter-time warner cable tie-up