As noted earlier, on June 7 the Arizona legislature filed an interesting federal case, arguing that Independent Redistricting Commissions are unconstitutional as applied to U.S. House elections, because the Elections Clause in Article One of the U.S. Constitution requires that legislatures themselves must pass all state laws relating to congressional elections. That case is Arizona State Legislature v Arizona Independent Redistricting Commission, 2:12-cv-1211.
The legislature probably made a legal error when it asked for a 3-judge U.S. District Court. The redistricting commission is arguing that this case is not appropriate for a 3-judge U.S. District Court. Federal law says cases challenging redistricting of congressional elections goes to a 3-judge court, but the redistricting commission says this case isn’t about whether the redistricting plan itself is unlawful, but instead is a case about the method by which Arizona carries out redistricting. This side dispute is eating up valuable time, if the legislature wanted to get the case settled quickly.