Two petitioning candidates for the U.S. House in Illinois will probably file a federal lawsuit soon. It will allege that because Illinois only requires 5,000 signatures (exactly) in years after redistricting, therefore there is no state interest in requiring between 9,000 and 15,000 in all other election years.
Illinois is the only state that has ever had a fixed petition requirement for petitioning candidates for U.S. House in certain years (years such as 1982, 1992, 2002, 2012), and a much higher requirement in all other election years (5% of the last vote cast). Therefore, there are no precedents on-point.
Libertarian nominee Dan Druck collected 7,153 signatures this year, and independent Allan Stevo collected approximately 7,100. Both were challenged on the last day for challenges. The law required Druck to collect 9,858 valid signatures, and Stevo needed 10,111. The requirements are considerably higher in mid-term years.