just in to cnn, the justice department has filed a lawsuit against sheriff joe arpaio, the sheriff of maricopa county, arizona. we understand that the lawsuit says sheriff arpaio has not cooperated with the probe of his office. the justice department gave arpaio until august 17th, to hand over documents it first asked for 15 months ago. what's the at the crux of this? it seems negotiations have failed to produce an agreement on the government's request on documents to investigate possible discrimination against hispanics, we'll continue to follow developments on this front. breaking news from the gulf of mexico, it will sound all too familiar. an oil rig 90 miles south of the louisiana coastline is burning right now. it exploded last hour. 13 workers were on the rig.