Live: Supreme Court hears arguments over Illinois mail-in ballots case

(NewsNation) — The Supreme Court is set to hear arguments regarding a lawsuit over an Illinois law that allows the counting of ballots after Election Day.

The court will not be weighing in on the law itself, but on the question of who is allowed to file a lawsuit over such policies.

Rep. Mike Bost, R-Illinois, filed the suit, arguing the law — which allows ballots to be counted after Election Day so long as they are postmarked by the deadline — is an illegal extension of voting.

Lower courts threw out the case, ruling Bost did not have standing to bring the lawsuit because he was not specifically harmed.

Bost argued campaigns suffer financial harm because they must staff past Election Day while waiting for final results to be tallied.

The Illinois Board of Elections argued Bost's claim was too speculative and that allowing him to file the lawsuit would open the door for frivolous lawsuits over election rules.

President Donald Trump has supported the challenge to mail-in ballots, something he has long sought to eliminate.

If Bost prevails, it could revive the lawsuit in Illinois and spark similar cases in other states.