Des Moines, Ia- Iowa lawmakers are reviewing their options after U.S. Census officials confirm the population data for redrawing congressional and legislative districts won't be delivered until this fall. Radio Iowa's O. Kay Henderson reports that every ten years, the contours of congressional and legislative districts are redrawn to account for population changes. Iowa's Constitution requires the legislature to approve new maps by September 1st. U.S. Census Bureau officials say the data on which those maps are based won't be delivered until September 30th. Senate Republican Leader Jack Whitver says the realities of the pandemic, the Iowa Constitution and the U.S. Constitution are creating a unique set of challenges and the Senate is evaluating its options on how best to proceed. Iowa House Speaker Pat Grassley says lawmakers are working with the Legislative Services Agency to determine their options and how to best to maintain the integrity of the redistricting process.