NEW : Issa threatens prosecutors with contempt over gun charges . A Democratic report blames agents in Arizona for Fast and Furious . A top Republican critic calls it ` ` a knee - jerk defense '' of Washington allies . The botched investigation allowed hundreds of agents to reach Mexican drug dealers .
NEW : Issa threatens Holder with contempt over gun probe . A Democratic report blames agents in Arizona for Fast and Furious . A top Republican critic calls it `` a knee-jerk defense '' of Washington allies . The botched investigation allowed hundreds of guns to reach Mexican drug gangs .