>> reporter: yesterday brian's mother and sister made the trek in the desert to the monoument that marks the spot where byron died. ibly an team's fired bone bags and mexicans returned fire with assault weapons provided by the u.s. government through operation fast and furious. and terry died almost immediately. the families are continuing to pursue the claim against the u.s. government claiming that it could and should have known that the weapons provided to the cartel would kill people. and house leaders are pursuing their case against the attorney general with with holding documents that shoes a cover up. >> we'll debate that also. and what can we expect from the hearing and will there be more arrest in the case. our legal panel will take up that up today. more trouble for obama care.