From the National Journal: In a letter sent to the FCC on Thursday, 33 senators asked the commission to revoke a waiver granted to LightSquared.

The lawmakers, including Sens. Pat Roberts (R-Kan.) and Ben Nelson (D-Neb.) call on the FCC to make LightSquared prove its system won't cause interference before it can start operating.

LightSquared Executive Vice President Jeff Carlisle said there are technical ways to reduce potential interference and says the company is operating well within FCC guidelines. Read the entire article here.