2014/04/02 Headlines: GM CEO Apologizes to Victims, Fails to Explain Negligence; Obama Celebrates Health Law Enrollment Numbers; Obama Admin Confirms Warrantless "Backdoor" Searches Target U.S. Citizens; NATO Suspends Formal Cooperation With Russia; Palestinian Authority Signs International Conventions after Israel Reneges on Prisoner Release; Obama Admin: No Decision on Release of Jailed Spy; Group: Syrian Death Toll Could Reach 220,000; House Votes to Block Climate Research; Koch-Backed Measure Bans Transit Funding in Tennessee; Chile Declares State of Emergency After Earthquake Triggers Tsunami