Friday 20 May - Sunday 22 May 2016: The Illinois Republican Party State Convention convenes to choose the 12 statewide delegates according to the results of the primary.

State Representative Scott Drury (Democratic) introduced HB 193 on 14 January 2015. This bill would move the Presidential and the partisan primaries from the 3rd Tuesday in March to the 4th Tuesday in June.

HB 3107, introduced by state Representative. Steven Andersson (Republican) on 24 February 2015, would move the Presidential and the partisan primaries from the 3rd Tuesday in March to the 3rd Tuesday in July.