The debate over what to do with the 700 MHz band D Block is about to take another twist when a key House committee debates the issue Thursday. Public-safety groups have urged the FCC to back away from its proposal to re-auction the spectrum, and instead allocate it directly to first responders. The groups, which say they need more spectrum than they currently have in order to build a nationwide, interoperable broadband network, are backed by AT&T (NYSE:T), Verizon (NYSE:VZ) and Motorola (NYSE:MOT). The bill the House Energy and Commerce Committee is going to debate is largely modeled on the FCC's recommendations to auction the spectrum to the highest bidder and dole out federal money to help construct the network. The proposal is receiving resistance from the public-safety groups and their backers. Article