Illinois lawmakers are likely to push back next year’s March primary election until June because of delays in receiving U.S. Census data they will use to draw new state congressional districts, three sources familiar the plan confirmed Friday.

Under the timeline for the currently scheduled March 15, 2022, primary, candidates could begin circulating their nominating petitions to appear on the ballot at the end of August, with filing set to begin on Nov. 22. If lawmakers don’t approve a congressional map until sometime in the fall, as expected, that would leave little time to qualify for the ballot under the current timetable.

The detailed census data that is usually used for the every-decade process of redrawing political boundaries is not expected until at least mid-August, delays due in large part to the pandemic as well as efforts by former President Donald Trump’s administration to eliminate noncitizens from the count.

While the state constitution sets a June 30 date for state legislative mapmaking, no such deadline exists for drawing up a congressional map. Challenges in federal court to new congressional map lines over issues like federal voting rights violations and one-person, one-vote requirements, are much more likely if the boundaries are drawn with estimated survey data rather than actual specific census figures.